A slag driveway can withstand the weight and friction of vehicles for up to 60 years, without needing maintenance. As with many other types of vintage glassware, the slag glass technique can be found in all sorts of different pieces, decorative or functional. Introduction: My name is Dr. Pierre Goyette, I am a enchanting, powerful, jolly, rich, graceful, colorful, zany person who loves writing and wants to share my knowledge and understanding with you. An official website of the United States government. These are just a few of the companies that produce authentic slag glass. Slag glass antique lamps sell between $200 and $2,000, and most of the value is in the light itself. Color, age, and manufacturer are definitely important in determining the value of a vintage piece. Although, the majority of slag glassware was created as decorative pieces. Remember, the most common way to make slag glass was by skimming silicate material from the top of molten iron. All rights reserved. In some of the most stunning lighting pieces, small pieces of the slag glass were laid out in a metal framework. Required fields are marked *. Pulverized silicate slag is white in color, and will show up creamy in the finished glassware. On the other hand, slag glass can easily leave people confused. When iron-ore is smelting during steel production, the remaining residue is a glass-like, glossy material. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. While collectible, the price range varies greatly depending on the item and manufacturer. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. Manufacturers experimented with different methods to achieve this malachite-like look. During the fluxing process, slag removes the non-ferrous constituents from the molten iron, which purifies the product. Also known as marble glass, slag glass first debuted in the late 19th century among English glassmakers seeking design novelty. One of the most common alternate names for slag glass is marble glass, for obvious reasons. Slag is used to refer to the by-product that shows up when various ores and metals are smelted. $24.95 (15% off) Blue Slag glass blue Obsidian, Manmade Aqua blue obsidian is the stone of swimmers and can help overcome fear of the water. Condition. Pamela has over 30 years of experience and has been writing for 20 years. Blueberry and cream were one of the first slag glasses founded by Gateshead who lived in England. Kellyco Metal Detectors posted on eBay that it can sell for $300 per gram or more meaning 1 pound could be worth $1 million. The World Steel Association (WSA) estimates that 600 kg of by-products (about 90 wt% is slags) are generated per tonne of steel produced. 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 colour (smelting slag and cullet glass are not really that deep black) as well as flow banding that looks more even natural than some of what one sees on swirly slag and cullet. Nearby Recently Sold Homes. You'll find slag glass in blues, browns, and greens as well, though these colors are rarer than the brown/white/cream and purple formulations. This is great! Some of the most costly slag glass pieces take the form of lampshades by well-known makers like Handel, Bradley Hubbard, and Tiffany. Some of these names can be used synonymously, but some of them have slightly different meanings that a serious collector should be aware of. [5], In nature, iron, copper, lead, nickel, and other metals are found in impure states called ores, often oxidized and mixed in with silicates of other metals. You can find antique slag lighting fixtures for sale on websites such as Etsy for as low as $20 or as much as $16,000. I'm Stacy Jones and I love antiques! Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. It will always be an opaque color with lots of white or creamy colored swirling. On this Wikipedia the language links are at the top of the page across from the article title. How do you grind glass without a grinder? This antique glass is known by other names including: Brown malachite Brown marble vitro porcelain Mosaic glass Marble glass Variegated glass Image Credit What Is Slag Glass Made Of? Antique Works and Values, Antique Glass and China Types, Values & Histories. Slag glass gets its name from slag, or the byproduct of steel production. Identification Tips & History Highlights, One of the most unusual types of antique glass that collectors can investigate, Vaseline glass is absolutely fascinating due to its color, history, and radioactive components. 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. Instead of taking your glass to the grinder to clean your edges, just run the surface of the stone against the area of your glass that needs smoothing. [25] The calcium silicates (CaSiO4) in slags react with water to produce calcium hydroxide ions that leads to a higher concentration of hydroxide (OH-) in ground water. GGBFS react with portlandite (Ca(OH)2), which is formed during cement hydration, via the pozzolanic reaction to produce cementitious properties that primarily contribute to the later strength gain of concrete. [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. Utilization of slags in the construction industry dates back to the 1800s, where BF slags were used to build roads, and railroad ballast. Slag is the collection of compounds that are removed. (Video) Collecting 101: Slag Glass! This is one of the most common uses for slag glass, and you'll see many slag glass chandeliers and other fixtures in antique shops. A well-crafted piece of slag glass with the right ratio of additive and correct amount of mixing will strike the perfect balance between looking too chunky and looking too homogenous. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. A similar look can be produced using multiple colors of glass mixed together, each individually colored using various compounds. Ferrous slag is currently underutilized. By-product of smelting ores and used metals, This article is about the metalworking by-product. Fenton, Mosser, Boyd Glass, and Summit are some of the common, modern, U.S. manufacturers of slag glass. 10.2.2 Blast furnace slag. Heavy iron meteorites are frequently solid, dark-grey in color. Density: Meteorites are usually quite heavy for their size, since they contain metallic iron and dense minerals. 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. Save my name, email, and website in this browser for the next time I comment. Other manufacturers quickly caught on and the style rose in popularity soon following its creation. The most effective method to detoxify alkaline ground water discharge is air sparging. Oftentimes the pieces labeled as variegated glass have more stripey streaks in contrast to the more organic swirls of a true marble pattern. Leaching concerns are typically around non-ferrous or base metal slags, which tend to have higher concentrations of toxic elements. For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. Slag can also be used to create fibers used as an insulation material called slag wool. Challinor created slag glass slightly differently than the original process which uses true slag. Stone Shop, InSpyritMetaphysical (5,660) $2.50 Vintage Boyd Blue Slag Glass Elephant Head Toothpick Matchstick Holder, Elephant Lovers, Vintage Blue & White Slag Glass HoosierGirlTreasures (83) (Video) Is it slag? Meteorites are quite valuable, worth as much as $1,000 per gram, according to the LiveScience website. The value of slag glass antiques ranges from $20 $20,000. How Much Is Slag Glass Worth? American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Typically slag glass antiques will be vases, dishes, bowls and decorative figurines and picture frames. Most manufacturers use up tp 40% to 60% recycled glass content. The value of slag glass items can also be determined by the condition of the item. Ruby Red LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Many of the same designs for milk glass were also produced in slag glass. 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. Brown and purple are the most common colors for vintage pieces but Sowerby, as well as other manufacturers, also created some pieces in blue and green with the typical white streaking. Slag glass was originally created in the United Kingdom in the 1890s by adding this slag substance during the glass-making process. "Glass slag is similar to obsidian; it, too, consists mainly of silica dioxide. Atterbury & Company, Challinor Taylor & Company, and H. Northwood Glass Company are some well-known manufacturers from the United States. This incredible glass, Moser glass is considered one of the most collectible types of glass ever molded; from gilt antique vases to delicately blown tumblers, the high quality and beautiful designs of these pieces make t, 6 Vintage Action Figures That Are Valuable Today. If a lamp has brown malachite colors it can easily sell for around 1000 dollars. 12. Slag is usually a mixture of metal oxides and silicon dioxide; however, slags can contain metal sulfides and elemental metals. 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. I grew up going to antique stores and markets with my mom and grandmother. The mosaic glass created in Pittsburgh was a mixture of purple and either white or an opal shade. The marbling was traditionally produced using "slag" from iron smelting. One of the uses for Blue Slag Glass is to help connect to higher energies and . This leads to concrete with reduced permeability and better durability. BRASS SHOWS NORMAL & NATURAL TARNISH & PATINA COMMENSURATE TO AGE. This created the marbled effect and bright variations in color that make slag glass so unique. 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. They started with brown glass, but also produced purple, yellow, green, and blue. Your email address will not be published. The marbling is sometimes compared to tortoiseshell. Unsigned decorative glass items like compotes and vases tend to sell between $5 $50, even if they are from the 19th century. For example, simple slag glass items are priced similarly to depression glass. It's formed by heating ores (rock) to high temperatures. Recognizing slag glass is easy due to the distinctive coloration. Glass manufacturers were thought to have added slag from iron smelting to molten glass. Thus, clinkers are a form of slag. A mark for Sowerby, Davidson, or Greeners will indicate a vintage U.K. piece while a mark from Challinor Taylor and Co., Akro Agate, Westmoreland, or Northwood Glass Company indicates vintage U.S. glass. 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