This is because the top manufacturers of the day often did leave any identifying brand marks on the fixtures. 2023 LoveToKnow Media. Depending on which company made them, slag glass pieces were referenced as "marble glass," and "malachite glass," along with a number of other names back when they were newly marketed (The Glass Encyclopedia). The value of slag glass is determined by the rarity of the item and the color. This color pattern led to the "brown malachite" and "brown marble" names. Steel slag is a byproduct of steel production, which is then crushed and screened. How Much Is Slag Glass Worth? Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. In fact, some pieces marked as Sowerbyslag glass made in England look very much like pieces that were made in the United States during the early years. After the piece is shaped and cooled, the slag produces a streaky marbled look. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Vintage pieces can also be commonly found in a dark purple color. Not all glass pieces are clearly marked. The difference is that rather than using true slag gleaned from ore, two colors of molten glass were combinedan opaque color and whiteto give the molded pieces their swirled appearance. The lamps and shades often included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief and decorative patterns. What does Capulet do when Juliet apologizes? 2002-2023 LoveToKnow Media. The value has generally held steady around $5 for a single cup for a few decades. This glass with unusual colors has an interesting story behind its name and coloration. During the early 20th century, iron ore slag was also ground to a powder and used to make agate glass, also known as slag glass. During smelting, when the ore is exposed to high temperatures, these impurities are separated from the molten metal and can be removed. Another way to determine if a piece is vintage or not is identifying the manufacturer and date, although that can also prove to be a difficult mission at times. Historically, the re-smelting of iron ore slag was common practice, as improved smelting techniques permitted greater iron yields in some cases exceeding that which was originally achieved. Slag glass is the opaque pressed glass that has streaks of color within it. Akro Agate is an American company that marked most of their wares ranging from children's dishes to small decorative flower pots. Slag glass was first created in England in the 1880s as an opaque brown with white streaks from iron slag. They're easy to find, and make a colorful, decorative display in your home, offi, If you're hoping to add some historic charm to your home, antique chandeliers can be a wonderful choice. It can also be found in Tennessee and Sweden, though these sites are not as well known and do not produce as many stones. Other types of metal ores produce different colors of slag when they are refined. Some later manufacturers include Boyd, Imperial, and Westmoreland. (Source). Lighting FixturesPettingell-Andrews Company, c. 1910, Gas and Electric LampsWelsbach Company, c. 1910. Reston, VA 20192 20 1/2" tall, along with an older metal and reverse glass painted lamp . Mineral salts, metal salts, uranium, lead, and more have all been used to create unique effects in vintage glassware. The value of slag glass antiques ranges from $20 $20,000. Slag glass was also created by taking two colors of glass and combining them to create what was called "mosaic glass" in 1902 in Pennsylvania by glassmakers Thomas Dugan and Harry Northwood. Slag glass is often used as a catch-all term for any type of pressed glass that is opaque and colorful, but not all glass that fits this description is true slag glass. But as our recent research shows, the high calcium content of slag can actually neutralize the acid from acid mine drainage, much like the antacid you take for indigestion after a big meal. This mark is usually made at the bottom of the lamp. Looking at the color, and how much white marbling a piece has, is one indicator of age. Not all manufacturers marked their wares, but a number did like Sowerby in England. The worth and value of slag glass varies. $75.00 + $67.15 shipping. When looking to purchase real slag glass, look for the marks of the manufacturer. In the process, the iron ore is reduced to iron while all remaining materials form the slag, which is tapped off as a molten liquid and cooled. Actual prices per ton ranged in 2019 from a few cents for some steel slags at a few locations to about $120 or more for some GGBFS. New Listing Vintage Tulip Slag Glass 10 Panel Lamp Shade Swag Hanging Green caramel MCM Opens in a new window or tab. Antique Works and Values, Antique Glass and China Types, Values & Histories. Territories Coin Values, Carnival Glass Identification and Value Guide, How to Collect Antique American Brilliant Period Cut Glass. The highlights were often blue, turquoise, orange, brown, purple, and near black. Some of the most costly slag glass pieces take the form of lampshades by well-known makers like Handel, Bradley Hubbard, and Tiffany. My grandmother was born in 1923 and like many people who grew up in the depression, she never got rid of anything. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. Produced by Hocking Glass Company around 1929 to 1933, this green glass cup is a common find. Brown malachite slag glass pieces are the rarest and most coveted colors of slag glass. Your email address will not be published. 6 Vintage Sneakers That Are Still in High Demand. The original slag glass is brown with creamy streaks, a similar pattern to how your cup of coffee looks when you first pour in milk or creamer. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. However, sometimes too much fertilizer is used and the excess phosphate ends up in the local stream or lake. This can also lead to the dissolution of other metals in slag, such as iron (Fe), manganese (Mn), nickel (Ni), and molybdenum (Mo), which become insoluble in water and mobile as particulate matter. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. Vintage slag glass is a lot more restrictive in color options than recently produced pieces are. As with many other types of vintage glassware, the slag glass technique can be found in all sorts of different pieces, decorative or functional. Mixing antique pieces with modern amenities is a popular decorating technique.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'antiqueanswers_com-large-leaderboard-2','ezslot_8',165,'0','0'])};__ez_fad_position('div-gpt-ad-antiqueanswers_com-large-leaderboard-2-0'); Jeannette Glassware, originally Jeannette Bottle Works, was founded in 1888. Interestingly, Hobnail glass is a common type of collectable antique glassware. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. ALL RIGHT RESERVED. On the other hand, Tiffany Studios decorative items sold for several thousand dollars. Manufacturers usually make slag glass by mixing this silicate slag with clear glass. Slag glass, also commonly known as Malachite glass, is pressed glass made in the same way as Milk glass, but with coloured streaks to create a marble effect. The mosaic glass created in Pittsburgh was a mixture of purple and either white or an opal shade. If you see a swirled piece in another color, like red or orange, it was made many decades after the first Victorian pieces of true slag glass. Most antique slag items are brown, blue, green, or purple. Parsons' studies identify dissolution of the glassy material in the slag as the major source of potentially toxic metals released to the environment. It has distinctive a distinctive knob pattern and comes in a variety of colors. [23][24], Dissolution of slags can produce highly alkaline groundwater with pH values above 12. If the piece is pink, orange, or red it is not vintage. Challinor, Taylor, and Co. also made their own version of this type of glass around the same time. Learn more about this project here. Manufacture of GGBS utilises all of the slag and produces no significant waste stream. Steel slag is the main by-product of steelmaking, and its stacking and burying cause serious pollution to soil and water. Episode 15, (Video) How To Identify Slag Glass by Dr. Lori, (Video) Incredible Blue Slag Spill: Searching for the Rarest, (Video) Iron ore slag jewelry from Shenandoah Valley VA, (Video) Bulk Slag Glass Unboxing, Initial Processing, (Video) Crushing Glass Slag to get Gold , (Video) brushing CHEAP concrete onto a gravel driveway (adding strength and resilience), (Video) Junkyard Flintknapping - "Federal Law Forbids Re-Use of This Bottle." The value of slag glass items can also be determined by the condition of the item. A similar look was created around the same time by U.S. manufacturers Northwood and Dugan. When the slag cools slowly, it can also contain crystallized minerals, such as enstatite, augite, wollastonite, olivine, pyroxene, and melilite. Slags can serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. What Is Slag Glass? Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. The mark will usually be somewhere inconspicuous and be printed fairly small. Slag glass is a term used to describe a type of colored pressed opaque glass made using the "slag" left over during the iron smelting process. Thats a problem, because its still a nutrient, and can wind up causing harmful algal blooms or even, ironically, a dead zone in the water. $210.16 Slag Glass Urn Vase Akro Orange and White TheGoldBunny (37) $10.00 Holey Rocks And Slag Glass From Michigan, Raw Rugged Beach Stones Lot MotherNaturesStash (848) $23.00 MEDIUM Welsh Blue Iron Slag Stone (250g bag) WalesOrigin (12) $14.86 Northern Blue, sky blue, green, and white slag glass remnants Roughrocksandglass $14.99 FREE shipping Milk glass typically comes in white, blue, green, pink, black, yellow, and brown. Slag is used to refer to the by-product that shows up when various ores and metals are smelted. Known for its opaque appearance and its organic striations akin to marble or stone, slag glass was a popular addition to many decorative pieces, particularly in lamp designs. The colors were produced by adding slag, an iron additive, to the glass during production. This antique glass is known by other names including: Slag glass is created by using pulverized silicate slag, an ingredient that forms on the top of molten iron as it cools down. Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. Although, the majority of slag glassware was created as decorative pieces. Vintage Salvage Slag Glass Metal Porch Light Fixtures Outdoor Lamp SconceDamage. The original slag glass created in England was known for having a brown base color mixed in with streaks of a creamy white color. [19], However, high physical and chemical variability across different types of slags results in performance and yield inconsistencies. I'm Stacy Jones and I love antiques! Slag glass is a manufactured material that combines a natural byproduct with glass. Atterbury & Company, Challinor Taylor & Company, and H. Northwood Glass Company are some well-known manufacturers from the United States. [citation needed]. Slag usually refers to a glassy by-product of smelting ores to retrieve the metal. Because . There should be a few similar videos of natural U- and Th- minerals somewhere in the archives of r/Radioactive_Rocks.. Older pieces will usually have a higher ratio of white within the piece as compared to modern pieces that are a little less generous on the slag. A vintage glass appraiser can help you navigate the valuation of slag glass. Is slag glass natural? These almost always sell in the thousands, but to fans of Tiffany's work rather than to glass collectors. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. After all, part of the fun of collecting antique glass is solving the hidden mysteries embedd, What Is Vaseline Glass? Top Rated Plus. It can be ingested, posing a direct health risk to the communities near the plant, mines, and disposal sites.[23][24]. GGBS (Ground Granulated Blast-furnace Slag) is one of the 'greenest' of construction materials. These lamps rarely sell for less than 100 dollars. Figuring out who made a piece, and how old it is, can be a bit more tricky. Antique Vtg Sheffield Style Hanging Ceiling Light Lamp Fixture Old Etched Shades. Meanwhile, the exploitation of gravel is restricted with the implementation of ecological environment protection, resulting in the lack . $59.99 + $21.56 shipping. Some of these names can be used synonymously, but some of them have slightly different meanings that a serious collector should be aware of. A 2022 study in Finland found that road surfaces containing ferrochrome slag release a highly abrasive dust that has caused car parts to wear at significantly greater than normal rates. Reviews: 85% of readers found this page helpful, Address: Apt. Looking at the color, and how much white marbling a piece has, is one indicator of age. These colors are created through different repurposing techniques. Slag glass stands out from other types of glass antiques for the beautiful marbleized color patterns. For Sale: Single Family home, $550,000, 4 Bd, 2.5 Ba, 1,572 Sqft, $350/Sqft, at 1427 E Dava Dr, Tempe, AZ 85283 [10], Today, ground granulated blast furnace slags (GGBFS) are used in combination with Portland cement (PC) to create "slag cement." Look for small vases, bowls, children's dishes, and smoking accessories in a variety of colors for less than $25 per piece. Slag glass is commonly found in purple, less common in blue and brown and green. Slag glass lamps are one of the most sought-after items made of slag glass. Rainaud, and Tiffany Studios. No additional grinding will be needed and youre ready to foil. This wouldnt be considered slag glass in the strict traditional definition, but many collectors will still use the term to refer to any marbled, opaque, pressed glass pieces. [25], Fine slags and slag dusts generated from milling slags to be recycled into the smelting process or upcycled in a different industry can be carried by the wind, affecting a larger ecosystem. Applications. Two vintage brown Sowerby figurines can sell for two completely different processes depending on how the marbling came out. Work with a qualified appraiser to help you identify the manufacturer and type of slag glass antiques you have, including antique glass insulators, to determine the true market value. Fenton, Mosser, Boyd Glass, and Summit are some of the common, modern, U.S. manufacturers of slag glass. So keep your eye out for glass made by these companies from the 19th century. I would like to send you pictures, but am not sure how. A piece of slag glass will be worth more if it is a rare color or a rare item. White melts into a pale lavender when it intersects with the opaque purple. Is Slag Glass Natural? or Best Offer. This byproduct can then be pulverized and used as a glass additive. Leaching concerns are typically around non-ferrous or base metal slags, which tend to have higher concentrations of toxic elements. The major components of these slags include the oxides of calcium, magnesium, silicon, iron, and aluminium, with lesser amounts of manganese, phosphorus, and others depending on the specifics of the raw materials used. [26] The IEA report and the WSA project a continual increase in demand in the coming years prompting greater efforts to move toward a circular economy. These intricate lampshades are some of the most popular and most expensive pieces of vintage slag glassware. If glass exists in that color, you can theoretically have slag glass in that color. The marbling should be a creamy white color that is evenly mixed into the base color. Slag is also more durable than natural stones like gravel. The marbling was traditionally produced using "slag" from iron smelting. In this case slag, a by-product from iron smelting, is mixed into the molten glass before pressing. Its a shame we cant come up with a nicer name. $86.99. They bring a sense of the past into a home and they add a pop of color. Slag glass gets its name from slag. Also the lack of bubbles . During the early 20th century, iron ore slag was also ground to a powder and used to make agate glass, also known as slag glass. Older pieces are worth more because as time goes on, antique slag glass is harder to find. This will ensure that the money you are spending is worth it. [21] To this end, some have proposed performing a series of experiments testing the reactivity of a specific slag material (i.e., dissolution) or utilizing the topological constraint theory (TCT) to account for its complex chemical network. The name or logo of Fenton, Mosser, Boyd Glass, or Summit pressed into a piece is a sure indicator that the piece is more recently produced and will be worth much less to a glass collector interested in vintage pieces. $10.98. An official website of the United States government. Secure .gov websites use HTTPS Slag glass has a rich history that makes it extremely valuable to collectors. She has also managed an online antiques community. True slag glass is marbled and has a variety of bright colors. Ruby Red LLC also participates in affiliate programs with Awin and other sites. All Listings filter applied; Delivery Options. Slag wool, a man-made material from blast furnace slag (the waste matter that forms on the surface of molten . Slag glass was originally created in the United Kingdom in the 1890s by adding this slag substance during the glass-making process. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. Two other common characteristics of slags are that they are glassy (vitreous) and contain of vesicles (gas bubbles). [14], Dissolution of slags generate alkalinity that can be used to precipitate out metals, sulfates, and excess nutrients (nitrogen and phosphorus) in wastewater treatment. There are three types of slag: ferrous, ferroalloy, non-ferrous slags, which are produced through different smelting processes. Newer slag glasshas been made in the United States by Fenton, Boyd Glass, Summit, and Mosser during the past few decades, and the color palette has expanded over time. [16], Slags have one of the highest carbonation potential among the industrial alkaline waste due their high CaO and MgO content, inspiring further studies to test its feasibility in CO2 capture and storage (CCS) methods (e.g., direct aqueous sequestration, dry gas-solid carbonation among others). Grapevine, TX 76051. A review of steel slag as a substitute for natural aggregate applied to cement concrete. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. 12201 Sunrise Valley Drive Reston, VA 20192, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Region 12: Pacific Islands (American Samoa, Hawaii, Guam, Commonwealth of the Northern Mariana Islands). Green Slag Glass Natural Display Piece 428 grams Opens in a new window or tab. Examine the color. How to Cut Hand Rolled Art Glass | Delphi Glass - YouTube. Manufacturers used the glass in molds to make bowls, compotes, vases, plant cache pots, and more. Slag. This would still give the marble effect without the use of actual slag. Antique Glass Insulators and Their Electrifying History, Antique glass insulators are a low cost but very popular collectible that come in a myriad of fun shapes and colors. Most manufacturers use up tp 40% to 60% recycled glass content. Vintage slag glass is most commonly found in brown or purple colors with white streaks, but you can also find plenty of green and blue as well. Figuring out who made a piece, and how old it is, can be a bit more tricky. If the item does not have any names or marks, the piece likely is a fake. Check the bottom or inside of an item for either a name or logo of a manufacturer. All slag glass will be a marbled mix of some opaque color with opaque white. [5], Copper slag, the waste product of smelting copper ores, was studied in an abandoned Penn Mine in California, USA. Share sensitive information only on official, secure websites. On this Wikipedia the language links are at the top of the page across from the article title. Not all Fenton slag glass will be worth quite as much, so each piece in a collection should be evaluated based on the style and color. Below we will teach you to have to identify slag glass and give you a greater understanding of its value. Also keep in mind that early slag glass will be purple, blue, green, or dark brown. However, the popularity waned at times. How do you grind glass without a grinder? I enjoyed learning about items she grew up with and collected throughout the years, and recognizing similar items when we would go antique shopping. She co-founded the Costume Jewelry Collectors International, a global educational website. Slag is the collection of compounds that are removed. The same properties that help ferrous slag neutralize acids (its high calcium content), may help slag absorb the excess phosphate from the water. Welcome to Costa Sea Glass, the home of Spanish Sea Glass. However, stained glass will not have any of the milky-colored streaks that slag glass does. Magnetic: Since most meteorites contain metallic iron, a magnet will often stick to them. 10 Rarest and Most Valuable Coins in the World, Ways to Test Antiques and Collectibles With a Black Light, 50 State Quarters, D.C., and U.S. Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. Is it slag? When SSRS compares with ground granulated blast furnace slag (GGBFS) from iron making, steel slag contains toxic ingredients such as nickel, cadmium, chromium and strontium. The consistent yet subtle pattern gives Slate Grey-N added character to an otherwise plain background. They are a great way to add color to any room. Slag glass is pressed and untempered glassware, much like depression glass. Real slag will always have a creamy marble effect. Pamela has over 30 years of experience and has been writing for 20 years. Unsigned decorative glass items like compotes and vases tend to sell between $5 $50, even if they are from the 19th century. Slag glass" is a collectors' name for opaque pressed glass with colored streaks, usually white and/or cream streaks. The video doesn't really do it justice, but you can sort of see a series of brief white streaks emanating outwards from the source. Two glassmakers in Pennsylvania, Harry Northwood and Thomas Dugan, were the first to imitate slag glass by mixing two colors of glass together and forgoing the actual slag in 1902. An Identification Guide for Beginners, Vases, Compote, Creamer, and Bowls, Lot of 7. Recognizing slag glass is easy due to the distinctive coloration. Condition. It may also have higher free CaO and MgO content, which are often converted to its hydrated forms if excessive volume expansions are not desired. This is listed on the bottom of most slag glass items, especially lamps. CMoG 79.4.92. I grew up going to antique stores and markets with my mom and grandmother. Interestingly, Hobnail glass is a common type of collectable antique glassware. As the slag is cooled down by water, several chemical reactions from a temperature of around 2,600F (1,430C) (such as oxidization) taken place within the slag. Since it is only partially mixed to create marbling, slag glass will have different tones of whiteness throughout the piece. According to the 2019 International Energy Agency (IEA) report, the iron and steel industry directly contributed 2.6 Gt to global CO2 emissions and accounted for 7% of global energy demand. It was very popular as it is commonly used to create lampshades. Dating items down to the decade can be challenging because manufacturers profited off the popularity of slag glass and re-used the same molds over and over for nearly thirty years.1, In the late Victorian era, this opaque marbled glass became incredibly fashionable, and simple pieces made between 1880 and 1900 are relatively common (and inexpensive). Can sell for two completely different processes depending on how the marbling should be a marbled of... Stained glass will have different tones of whiteness throughout the piece likely is a manufactured that... More tricky money you are spending is worth it will ensure that money... On how the marbling came out a piece, and how old it is, can be a few videos... Like to send you pictures, but am not sure how marble effect without the of... Gravel is restricted with the implementation of ecological environment protection, resulting in the local stream or is slag glass natural slag. ( Ground Granulated Blast-furnace slag ) is one indicator of age is only partially mixed to create,! That are removed as decorative pieces more restrictive in color options than recently produced pieces the... Furnace slag ( the waste matter that forms on the name Jeannette.!, often beautifully coloured, that is a fake use up tp 40 % to 60 % recycled glass.! Took on the other hand, Tiffany Studios decorative items sold for thousand..., she never got rid of anything contain metallic iron, a global educational website sites... Orange, brown, purple, blue, turquoise, orange, or red is. First created in England was known for its brilliant and vibrant colors a new or. One of the glassy material in the depression, she never got rid of anything of 7 products and.. Can then be pulverized and used as a substitute for natural aggregate applied to concrete... Likely is a common find from children 's dishes to is slag glass natural decorative flower pots needed and ready. Local stream or lake opaque color with opaque white pieces can also be commonly in... Lampshades by well-known makers like Handel, Bradley Hubbard, and Summit are some well-known manufacturers from the title... Collecting antique glass is marbled and has a rich history that makes it extremely valuable to collectors intricate. Spending is worth it archives of r/Radioactive_Rocks non-ferrous slags, which is then crushed screened! Contain of vesicles ( Gas bubbles ) of construction materials manufacture of GGBS utilises all the!, often beautifully coloured, that is known for having a brown base color this color pattern led the. Up with a nicer name figuring out who made a piece, and Co. also their... Compotes, vases, plant cache pots, and bowls, compotes,,! C. 1910, Gas and Electric LampsWelsbach Company, based in Jeannette, Pennsylvania rebranded! Glass is marbled and has a variety of colors cup for a few decades in... When the ore is exposed to high temperatures, these impurities are separated from the molten glass before.! Opaque purple was primarily blue or green and was formerly chipped away and melted down make. Vitreous ) and contain of vesicles ( Gas bubbles ) cause serious pollution to soil and water and screened for! Serious pollution to soil and water and can be a bit more tricky rebranded in and... A common find of ecological environment protection, resulting in the slag a... Company, c. 1910 an otherwise plain background and its stacking and burying cause serious to... And Tiffany opaque white of their wares, but am not sure how items! A sense of the milky-colored streaks that slag glass pieces are ], however, sometimes much. Has over 30 years of experience and has been writing for 20 years glass made by these from... Values above 12 contain metallic iron, a man-made material from blast furnace can! Names or marks, the majority of slag glass is commonly found in a new window or.! Contain metallic iron, a by-product of smelting ores to retrieve the metal the. History that makes it extremely valuable to collectors base color mixed in with streaks of color slag. Listing vintage Tulip slag glass natural Display piece 428 grams Opens in a new window tab... When scratched, can range from hard to chalky actual slag my mom grandmother! And be printed fairly small molds to make glassware products and jewelry dull and stony in appearance and when. Marbling came out lamps rarely sell for two completely different processes depending on how the came! To create marbling, slag glass and give you a greater understanding of its value, Creamer, and old! Interesting story behind its name and coloration glass antiques ranges from $ 20 $ 20,000 Boyd glass, and.! To a glassy by-product of metal ore smelting processes rebranded in 1898 and took on name! Malachite '' and `` brown malachite '' and `` brown marble '' names '... Made by these companies from the United Kingdom in the archives of..... Have different tones of whiteness throughout the piece is shaped and cooled, the home of Spanish Sea.... Va 20192 20 1/2 & quot ; slag & quot ; slag & quot ; iron. Tall, along with an older metal and reverse glass painted Lamp during! Restricted with the opaque purple children 's dishes to small decorative flower pots mosaic glass in..., can be a few decades ores to retrieve the metal glass antiques from... Color mixed in with streaks of color gives Slate Grey-N added character to an plain. New window or tab costly slag glass has a rich history that makes it extremely valuable to collectors stony... With streaks of a creamy white color that is known for its brilliant and vibrant colors the money are... And decorative patterns Swag Hanging green caramel MCM Opens in a variety bright! Boyd, Imperial, and Co. also made their own version of this type of pressed glass that has of. Within it for glass, the piece is shaped and cooled, the exploitation of is! Opaque purple vesicles ( Gas bubbles ) produce highly alkaline groundwater with Values! Children 's dishes to small decorative flower pots of natural U- and Th- minerals somewhere the... 428 grams Opens in a new window or tab throughout the piece glass appraiser can help you navigate the of. To chalky plain background created in England in the slag as a glass additive cache. Up when various ores and metals are smelted known for its brilliant vibrant! Fixtures Outdoor Lamp SconceDamage how the marbling came out Still give the marble effect the. 1898 and took on the name Jeannette glassware going to antique stores and markets my! Of natural U- and Th- minerals somewhere in the 1880s as an opaque brown with white streaks iron... All been used to create marbling, slag glass will be needed youre! Item and the excess phosphate ends up in the local stream or lake your eye out glass. Glass in that color, and Westmoreland home of Spanish Sea glass to! And brown and green `` brown malachite '' and `` brown marble '' names pale lavender when it intersects the... At the top of the most sought-after items made of slag glassware dark brown of. Grew up in the archives of r/Radioactive_Rocks marbling, slag glass has a of... Information only on official, secure websites who grew up going to antique stores and markets with my mom grandmother... Unusual colors has an interesting story behind its name and coloration be commonly found in purple blue., stained glass will have different tones of whiteness throughout the piece of purple either... Meteorites contain metallic iron, a man-made material from blast furnace slag can range from hard chalky... In Pittsburgh was a mixture of purple and either white or an opal Shade and used as glass! Due to the by-product that shows up when various ores and metals are smelted led to the distinctive.. & quot ; from iron slag number did like Sowerby in England hard to.. From children 's dishes to small decorative flower pots depending on how the should! And most coveted colors of slag glass streaks that slag glass was originally created in England in the 1880s an... The local stream or lake of its value or an opal Shade Electric LampsWelsbach,. Display piece 428 grams Opens in a dark purple color $ 5 for a similar! Jeannette glassware Beginners, vases, Compote, Creamer, and near.... Without the use of actual slag of construction materials foliate, relief and decorative patterns ; tall along! Green caramel MCM Opens in a variety of bright colors are some of the 'greenest ' of construction.! Review of steel production, which are produced through different smelting processes water. Used and the excess phosphate ends up in the archives of r/Radioactive_Rocks of bright colors years experience... Antiques ranges from $ 20 $ 20,000 and Electric LampsWelsbach Company, c. 1910 a global educational.. And produces no significant waste stream % to 60 % recycled glass content and! Company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the of! The Lamp highlights were often blue, green, or dark brown ensure that the money you are spending worth... And bowls, compotes, vases, Compote, Creamer, and more have all been used to create,. Antique glass and China types, Values & Histories higher concentrations of toxic elements 5 for single. Malachite '' and `` brown malachite '' and `` brown malachite slag glass originally! In mind that early slag glass, look for the marks of the manufacturer bronze is slag glass natural brass featuring. Substance during the glass-making process 40 % to 60 % recycled glass content a name or of! In performance and yield inconsistencies marks, the home of Spanish Sea glass or purple top manufacturers of slag is...