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Purple
ANSWERS: 1
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Hi, The main ingredient used to transform clear glass to a greenish color is Iron Oxide or "ferrous oxide". Chromium Oxide, an inorganic compound commonly used as a pigment in many art materials, is also used in green glass production. I hope this helps answer your question or gives you a direction to search for further information. Robin Miltner www.SNCA.org Art Studio Director
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