WebApr 11, 2024 · Metal Melting Furnace Gold,Copper,Silver Jewelry Aluminum Iron Steel Induction Melting Furnace,Goldsmith Casting with Mesh Guard and with Graphite Crucible,Red-220V-1kg : Amazon.ca: Industrial & Scientific WebSep 19, 2016 · The first reaction that gives patina its color is when one molecule of carbon dioxide and one molecule of water, both in the air, react with two molecules of copper oxide on the surface of the copper. The result is a compound called malachite (Equation 4), which varies in color from shades of dark green to shades of blue.
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