In both cases cobalt oxide produces the distinctive cobalt coloring. A cobalt blue nut bowl of the royal lace depression glass pattern manufactured by the hazel atlas company of clarksburg west virginia and zanesville ohio.
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Vintage hazel atlas cobalt blue depression glass milk pitcher or creamer unmarked 1930s vintage hazel atlas glass pitcher in cobalt blue.
Cobalt blue depression glass coloring pages. Vintage cobalt blue depression glass double hourglass vase 61 2 tall 20 97 was. Often called a violin or viobot this is actually an ear fiddle bottle. Free shipping on many items browse your favorite brands affordable prices.
Glass coloring and color marking may be obtained by in several ways. Story has that grandpa won it at a carnival in the 30 s. 29 95 7 54 shipping or best offer 15 watching watch cobalt blue art glass vase with clear applied scroll handles pitcher w handle 49.
Most clear glass begins as a combination of a silica or sand plus soda and lime. This is a lovely cobalt blue hazel atlas one cup measuring cup. Excellent vintage condition with no.
This is about 4 1 2 tall in very nice condition without damage. Cobalt glass known as smalt when ground as a pigment is a deep blue coloured glass prepared by including a cobalt compound typically cobalt oxide or cobalt carbonate in a glass melt. Sometimes it is necessary to remove unwanted color caused by impurities to make clear glass or to prepare it for coloring.
Violin bottles do not have the tuning pegs on the side. Cobalt glass plates are used as an optical. Another treasure from great grandma eleanor s kitchen.
Cobalt blue is highly prized both as a pigment and as an unusual color for glass. Photo copyright depression glass. Cobalt is a very intense colouring agent and very little is required to show a noticeable amount of colour.
Examples of popular colored glasses include ruby glass invented in 1679 using gold chloride and uranium glass invented in the 1830s glass that glows in the dark made using uranium oxide. Beautiful dark cobalt blue glass made by the maryland glass company from the 1930 s up to the 1950 s. Glass makers add elements and minerals such as iron or cobalt oxide to derive.
By the addition of coloring ions 1 2 by precipitation of nanometer sized colloides so called striking glasses 1 such as gold ruby 3 or red selenium ruby 2 ancient roman enamelled glass 1st century begram hoard by colored inclusions as in milk glass and smoked.
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