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How Green Glass Got Its Color
Olive green onion-type demijohn bottle, circa 1850, 16 1/2" tall, sold for $570 at Morphy Auctions in October, 2011
- Morphy Auctions
Green antique glass was given its color by adding iron oxide to a molten glass mixture of sand, potash and lime. Varying shades of green ranging from light to dark with an olive hue, were achieved by lowering the amount of iron oxide added to the glass mixture.
This type of glass should not be confused with green Depression glass containing uranium oxide, or vaseline glass, which is more yellow in color and will also fluoresce under ultraviolet light due to uranium content.
Continue to page 5 to learn about BROWN glass.