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<p>[QUOTE=&quot;rrdenarius, post: 2422181, member: 75525&quot;]Nice coin and interesting experiment. I probably would use a different piece of metal to do reaction studies, but I am an engineer and hate to test with a limited product that took so long to make. </p><p>Some random thoughts:</p><p>I do not see any reference to speeding up the process with sun light. </p><p>Increasing temperature would increase the process.</p><p>Has anyone tried speeding up the chemical reaction by adding CO2? </p><p>This could be done in solution with DI water and baking soda (not powder).</p><p>You could get a small bottle of CO2 from a beverage store. </p><p>A baking dish in a gas oven at low temperature would have both CO2 and water.</p><p><br /></p><p>Copper (I) oxide, Cu2O, red</p><p>Copper (II) oxide, CuO, black</p><p>Azurite, Cu3(CO3)2(OH)2, blue</p><p>Malachite, Cu(CO3)(OH)2, green</p><p>CuCl2, Copper (II) Chloride turns from brown to blue on hydration</p><p>CuCl, Copper (I) Chloride is a yellowish brown solid that turns blue green with the addition of water (di-hydrate)[/QUOTE]</p><p><br /></p>

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