Click to reveal The history of slag glass goes back to the late 1890s in Gateshead in the northeast of England. Happy collecting! Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. Lamps, lampshades, and chandeliers were very popular uses for slag glass. This byproduct can then be pulverized and used as a glass additive. Happy searching for your favorite color of slag glass! Some stained glass pieces may appear very similar to all of the small pieces in beautiful patterns. Telling slag glass apart from other styles is actually quite simple. Handel Lamps - oldlampvalues Your lamp appears to have six panels and looks to be in very good condition. Discerning Victorian consumers resisted purchasing marbleized glass in some cases and preferred more decorative elements in crystal. Production of slag glass originated in late 19th century England. Bradley Hubbard Lamp for sale | eBay Thanks for reading! Tiffany Lamps: Price Guide and How to Identify an Original - Invaluable This is due to the rarity of the color. 2002-2023 LoveToKnow Media. You can determine antique slag glass with a few steps: Slag glass antique items can run anywhere in value from a low of $50 to a high of $1,500. Real slag will always have a creamy marble effect. Slag glass is commonly found in antique lamps and light fixtures but can also be used for decorative windows or tiles. The visual marbling of this slag is reminiscent of slag glass, however, the presence of actual slag in slag glass pieces depends on how it was created. A piece of slag glass will be worth more if it is a rare color or a rare item. How to identify Fenton glassware 1. It is hard to keep fragile glass intact for decades. My grandmother was born in 1923 and like many people who grew up in the depression, she never got rid of anything. Antique Slag Glass Lamps | Collectors Weekly 1930s Traditional Slag Glass Lamp; Share. It was my grandmothers and is over 60 years old. 2. Some handmade collector marbles are small works of art that can command big prices. The key identifying feature of this type of glass is its similarities to the patterning found in natural marble. The Pittsburgh Lamp, Brass & Glass Company was assigned at least five lighting-related patents between August 28, 1900 and March 21, 1916. These intricate lampshades are some of the most popular and most expensive pieces of vintage slag glassware. Over time, other companies like Imperial Glass, Akro Agate, and Westmoreland began producing and selling their own versions of slag glass. Slag glass was a sought-after material for decorative items from the late 19th to the early 20th century. Identifying Silhouette Slag Glass Lamp In Antique American Lighting, Antiques, Uncategorized on February 8, 2016 at 7:02 pm. Set of four antique embossed brass hanging lamp socket covers, 3 3/4" in diameter overall. Slag Glass information from the Glass Encyclopedia I'm Stacy Jones and I love antiques! If they look and feel smooth and consistent, it was likely machine painted. 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. Prices go up significantly if a light is signed by a prominent manufacturer like Tiffany Studios or, to a lesser extent, Bradley & Hubbard. As technology and manufacturing changed over time, new colors have been introduced to the slag design. Lamp measures 5 1/2'' h. x 11'' x 5'', globe measures spelter figure of a standing woman on art nouveau style base, double socket fixture, no visible makers mark, 23 3/4'' h. x 7 1/2''. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. You can email the site owner to let them know you were blocked. Sowerby was a popular producer of this blackberries and cream slag look. Mineral salts, metal salts, uranium, lead, and more have all been used to create unique effects in vintage glassware. French Art Nouveau "La Serenade" Figural w/ Slag Glass Shade . 10 Easy Steps on How to Identify Slag Glass Step 1: Look for a Marbled or Swirled Pattern One of the easiest ways to identify slag glass is by its marbled or swirled pattern. It has distinctive a distinctive knob pattern and comes in a variety of colors. Assuming you have a table lamp with a large painted glass shade, then your shade should measure as 14, 15, 15.5, 16, or 18 inches. (Source). The mosaic glass created in Pittsburgh was a mixture of purple and either white or an opal shade. 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. L. G. Wright Glass - Guide to Value, Marks, History - WorthPoint 9. This is a big part of why slag glass is so valued today. White melts into a pale lavender when it intersects with the opaque purple. 1930s Traditional Slag Glass Lamp | Chairish Slag Glass Lamps - Ideas on Foter You may find one for as cheap as $230, but very rare pieces will definitely attract collectors and drive up prices into the thousands. Image 2: Tiffany Studios Patinated-Bronze and Leaded Favrile Glass Poinsettia Floor Lamp. Lamps, lampshades, and chandeliers were very popular uses for slag glass. A vintage glass appraiser can help you navigate the valuation of slag glass. Both styles create the same swirl effect, and originals of both are considered vintage and valuable. Signed slag glass tends to be worth more than unmarked slag glass. The light shining through the marbled color creates a really unique effect. The strict definition of slag glass means that it has powdered silicate slag from iron smelting mixed into the glass to create streaks. Spelter Newel Post Lamp w/ Czech Glass, FRENCH ART DECO SPELTER FIGURAL LAMP, Circa. A similar look was created around the same time by U.S. manufacturers Northwood and Dugan. While it may not be as popular as other types of glass, slag glass is beautiful in its own way. Your caramel slag glass paneled lamp dates from the 1910s through the 1920s. Serious antique glass collectors will be familiar with "slag glass" which became popular in the late 1800s and is still made today. You may also wish to polish the piece with a small amount of mineral oil for added shine and protection. The three lights retains their 1930s; verdigris patinated spelter female nude dancer, on new Donegan cast iron step base, one arm supports, light with frosted glass globe, 22 in. You can tell the age/authenticity of stained glass by looking at the glass that's used. . Additionally, the uniqueness and character of each individual piece can also affect its value. Find Fenton markings 3. Imperial Glass introduced its iridescent (carnival) glass line in 1909. True slag glass is richly marbleized, deeply colored glass rather than glass that is colored with pale swirls or streaks, which is also known as malachite, marbled and variegated glass. Identifying Silhouette Slag Glass Lamp | All About Antiques What is Slag Glass? Price Guide and History - Invaluable Other manufacturers quickly caught on and the style rose in popularity soon following its creation. This type of glass was used to make all types of glassware, including panels for lamp shades. . I grew up going to antique stores and markets with my mom and grandmother. There continues to be a vibrant market for antiques of all varieties due to their breathtaking beauty and exquisite designs. Hopefully, these tips will help make your search for slag glass a successful and enjoyable experience. early 20th century. The marbling on originals will always be uneven and more creamy than white. However, the popularity waned at times. Manufacturers used the glass in molds to make bowls, compotes, vases, plant cache pots, and more. Some well-known slag glass manufacturers include Sowerby, Davidson, and Greeners. Don't miss out on this valuable resource - visit our research tools today! Look for a Fenton tag (used before 1970), look for the Fenton mark ("Fenton" in an oval), look for "F" in an oval, indicating another company's mold was used (1983+). List of Vintage Lamp Manufacturers Advertisement About Paul Phipps Some slag glass may also have opaque white sections, often in the form of streaks or patches. Purple is the most common slag glass color. Known by various other names, slag glass is instantly recognizable by its opaque glass and smooth blend of colorful streaks, creating a distinct marble effect. Explore other items from ourAntiques & Collectibles Price Guide. Remember, the most common way to make slag glass was by skimming silicate material from the top of molten iron. Those who love, buy, or collect antiques will tell you that while price and value are important, they are really only half the battle. While Handel first produced mosaic glass shades for its lamps, they soon branched into other design areas. According to the Glass Encyclopedia, Slag glass is made by mixing pulverized silicate slaginto glass-pressing. Unsigned decorative glass items like compotes and vases tend to sell between $5 $50, even if they are from the 19th century. Amber Caramel Slag Glass Hanging Swag Lamp Light Lighting Fixture 70's 1970's. $74.99. Two vintage brown Sowerby figurines can sell for two completely different processes depending on how the marbling came out. Slag glass is named after silicate slag, a colorful material that is a byproduct of molten steel. These lamps rarely sell for less than 100 dollars. Brown with silky cream streaks was the first colorpalate of slag glass, and vintage pieces with this tint are some of the rarest and most valuable today. Look out for its bases and edges 4. This website is using a security service to protect itself from online attacks. Slag glass has a rich history that makes it extremely valuable to collectors. AMERICAN EARLY 20TH CENTURY SLAG GLASS LAMP, Nice, original 8 panel caramel slag glass, 384. Opalescent or iridescent glass can be worth more. Production of slag glass originated in late-19th-century England, where glass manufacturers are thought to have added slag from iron-smelting works to molten glass to create a range of effectsfrom tortoiseshell to marbling. The result is a material that lies somewhere between porcelain and glass. Save my name, email, and website in this browser for the next time I comment. Happy hunting! To test the texture, run your fingers over the surface of the glass. The base of slag glass is an opaque color, and the streaks are typically a milky white or cream color.
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