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. True slag glass is marbled and has a variety of bright colors. [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. Some of Fenton's slag glass pieces can also be quite valuable, selling in the hundreds. During the process of smelting iron, ferrous slag is created, but dominated by calcium and silicon compositions. On this Wikipedia the language links are at the top of the page across from the article title. "frit", a high density, vitreous, and abrasive material low in carbon and formed in various shapes from jagged and irregular pieces to rod and needle-like forms) and residual carbon char, the proportions of which vary depending on operating conditions, gasifier, Reviews: 85% of readers found this page helpful, Address: Apt. However, some of them, such as arsenic (As), iron, and manganese, can accumulate in groundwater and surface water to levels that can exceed environmental guidelines. Mosiac glass is sometimes used interchangeably with slag glass, although there are some technical differences. "Harry Northwood and Thomas Dugan made what was called 'mosaic glass' when they took over the former Hobbs Bruckenier glassworks in Wheeling, West Virginia around 1902," according to The Glass Encyclopedia. Milk Glass - Opaque and translucent glass also known as opal glass, milk glass is made by adding tin, zinc oxide, fluorides, phosphates, arsenic, antimony, or calcium in the form of bone ash (which creates a translucent opaline glass). Purple is the most common slag glass color. On the other hand, Tiffany Studios decorative items sold for several thousand dollars. These colors are created through different repurposing techniques. For many glass collectors, finding a beautiful treasure with antique glass markings is a special treat. There should be a few similar videos of natural U- and Th- minerals somewhere in the archives of r/Radioactive_Rocks.. Kellyco Metal Detectors posted on eBay that it can sell for $300 per gram or more meaning 1 pound could be worth $1 million. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. Is it slag? According to Norman Webber, some companies referred to slagware as end of the day wear because glassmakers collected slag from the surface of iron right before they poured it at the end of the day. On the other hand, slag glass can easily leave people confused. All Listings filter applied; Delivery Options. Pelletized slag is generally used for lightweight aggregate but can be ground into material similar to GGBFS. Some later manufacturers include Boyd, Imperial, and Westmoreland. 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. Theres a fairly large price range for slag glass, with intricate vintage lampshades fetching the highest price. A slag by-product of such workings was a colorful, glassy material found on the surfaces of slag from ancient copper foundries. . The mark will usually be somewhere inconspicuous and be printed fairly small. Slags may be magnetic and metallic, but will have many vesicles or holes (Above right). 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. By clicking Accept, you agree to our website's cookie use as described in our Cookie Policy. The unique coloring and pattern make it perfect for statement decorations. Image: Northwood Glass Works, Factory about 1898-1919. 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. 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 from steel mills in ferrous smelting is designed to minimize iron loss, which gives out the significant amount of iron, following by oxides of calcium, silicon, magnesium, and aluminium. Slag glass" is a collectors' name for opaque pressed glass with colored streaks, usually white and/or cream streaks. 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. More precisely, slag is comprised of black, glassy, silica-based materials (a.k.a. Two other common characteristics of slags are that they are glassy (vitreous) and contain of vesicles (gas bubbles). The mosaic glass created in Pittsburgh was a mixture of purple and either white or an opal shade. Real slag will always have a creamy marble effect. Fenton Art Glass Identification and Value Guide. Unlike any other type of glass, slag glass is not transparent. 2023 LoveToKnow Media. They bring a sense of the past into a home and they add a pop of color. [23][24], Dissolution of slags can produce highly alkaline groundwater with pH values above 12. Most antique slag items are brown, blue, green, or purple. Sowerby also created several other color formulas including Giallo (yellow), Pomona (green), and Sorbini (blue). Outside of the construction industry, it might seem that uses for slag are considered limited. Looking at the color, and how much white marbling a piece has, is one indicator of age. The value of slag glass antiques ranges from $20 $20,000. You can determine the age of a piece of slag by finding the date of production. Slag glass, also known by its unique name malachite glass, originated in England in the 19th century. Manufacturers experimented with different methods to achieve this malachite-like look. For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. The value has generally held steady around $5 for a single cup for a few decades. The marbling is sometimes compared to tortoiseshell. If the glassware is marked by the manufacturer, you can use that to reverse search information about your piece. The chart below highlights some recently sold slag glass items. Examine the color. In addition, slag glass panels were used in lamps, jewelry boxes, and other collectibles. Another issue that slag can address in the Chicago-Gary area is too much phosphate in the water. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. 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. Challinor, Taylor, and Co. also made their own version of this type of glass around the same time. How do you grind glass without a grinder? How can I tell if I found a meteorite? Fenton, Mosser, Boyd Glass, and Summit are some of the common, modern, U.S. manufacturers of slag glass. Slag glass is pressed and untempered glassware, much like depression glass. Many antique lamps of these periods were made with stained glass, rather than slag glass, and a careful review of the glass opacity and patterns is necessary to determine the difference. 10.2.2 Blast furnace slag. 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). Where the slag is really concentrated it will appear milky white. Newer glass by Fenton, Boyd, and Mosser may also be marked. As with many other types of vintage glassware, the slag glass technique can be found in all sorts of different pieces, decorative or functional. Slag glass is no longer produced as it once was. However, towards the edge of the streak, the slag may instead be a lighter and creamier version of whatever the base color was since they were more mixed together. Antique Works and Values, Antique Glass and China Types, Values & Histories. $14.46 shipping. Heavy iron meteorites are frequently solid, dark-grey in color. These easily sell for thousands when in excellent condition, with Tiffany being the top of the line, of course. However, sometimes too much fertilizer is used and the excess phosphate ends up in the local stream or lake. 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. Get DIY project ideas and easy-to-follow crafts to help you spruce up your space. Steel slag costs $25 to $39 per ton or $35 to $54 per yard, depending on the quantity ordered and size of stones. Leaching concerns are typically around non-ferrous or base metal slags, which tend to have higher concentrations of toxic elements. Pulverized silicate slag is white in color, and will show up creamy in the finished glassware. Also the lack of bubbles . Slag glass is named after silicate slag, a colorful material that is a byproduct of molten steel. BRASS SHOWS NORMAL & NATURAL TARNISH & PATINA COMMENSURATE TO AGE. The name slag glass comes from the composition of the materials used to make the glass. SOLD FEB 10, 2023. $35.00. Grapevine, TX 76051. 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 What is it called when you wake up during surgery but can't move? How Much Is Slag Glass Worth? For todays collectors, slag glass is a greatly sought-after item that can go for a lot of money. Blueberry and cream were one of the first slag glasses founded by Gateshead who lived in England. What does Capulet do when Juliet apologizes? We looked specifically at ferrous slag, the leftover material from the smelting of iron and steel, in the Chicago-Gary area of Illinois and Indiana. This would still give the marble effect without the use of actual slag. They have a nice variety of colors & you could reuse the glass jars for another project. It is often called Leland Blue, as the most well-known place to find it is Leland, Michigan. As a co-product of steelmaking, slag is typically produced either through the blast furnace - oxygen converter route or the electric arc furnace - ladle furnace route. Learn more about this project here. For example, slow cooled BF slags (or air-cooled slags) tend have more crystalline phases than quenched BF slags (ground granulated blast furnace slags) making it denser and better suited as an aggregate. Depending on the rarity of the item, slag glass is worth anywhere from $50 to $1500. $10.85 shipping. However, slags can contain metal sulfides and elemental metals. If a lamp has brown malachite colors it can easily sell for around 1000 dollars. They are a great way to add color to any room. Slag glass producers mark their products with the companys initials or the companys logo. 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. If you love the look of slag but dont want to pay extra for vintage, or are looking for a higher variety of options, check out some of the more recently produced glass pieces. 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. 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. 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. Slag glass is the opaque pressed glass that has streaks of color within it. 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. Remember, the most common way to make slag glass was by skimming silicate material from the top of molten iron. Many of the same designs for milk glass were also produced in slag glass. When identifying slag glass, look for a marbling effect. 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. Companies continued to make slag glass items well into the mid-20th century. This is listed on the bottom of most slag glass items, especially lamps. Pamela Wiggins is a highly regarded antique and collectible costume jewelry expert and appraiser. Glassmakers have achieved a similar-looking marbled effect to slag by simply mixing two different colors of glass together. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Some of the most popular manufacturers were Miller, Bradley & Hubbard, Empire Lamp Manufacturing Company, Pittsburgh Lamp, Brass and Glass Company, H.E. Ruby Red LLC is compensated for referring traffic and business to these companies. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); What is Slag Glass and where does it come from? Not only that, but it can even reduce acids that have built up in soils. She co-founded the Costume Jewelry Collectors International, a global educational website. Slag glass has a rich history that makes it extremely valuable to collectors. This is because the top manufacturers of the day often did leave any identifying brand marks on the fixtures. However, stained glass will not have any of the milky-colored streaks that slag glass does. After all, part of the fun of collecting antique glass is solving the hidden mysteries embedd, What Is Vaseline Glass? A similar look can be produced using multiple colors of glass mixed together, each individually colored using various compounds. However, since each piece will have very unique marbling patterns, the estimated value can vary greatly based on personal preference. Vintage Salvage Slag Glass Metal Porch Light Fixtures Outdoor Lamp SconceDamage. Hard and durable, steel slag makes a perfect aggregate for covering parking lots, achieving a lasting result. The marble should never be streaky and it should blend well with the color of the glass. How do you grind glass without a grinder? Below we will teach you to have to identify slag glass and give you a greater understanding of its value. Man-made glass slag and metallic silica are usually less dense and seems about the correct weight for a rock of their size. Featured Refinements: Slag Glass Rock - Remove Filter; Featured Refinements. Real slag glassware will also never just be one solid color, it will always be blended. In this case, the slag is termed synthetic. Acid mine drainage can happen when air and water mingle with various minerals such as iron sulfide (also known as pyrite or Fools Gold), creating sulfuric acid. There is another theory that slagware, and some other glass decorated with multi-colored enamels, were made up from odds-and-ends of glass left over at the end of the day, Webber reiterates.3, The most common base colors include white, cream, primrose, and blue. Slag glass is a man-made opaque base glass with marbelized swirls in a different color. 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