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Uploaded on Sep 16, 2010
Use chemistry to remove the copper plating on a penny YouTube user zbret... 3Ca(OH)2 + 4S -- 2CaS + CaS2O3+ 3H2O This liquid is known as Lime Sulfur and is made the same way - a surfactant plus Sulfur plus Calcium Hydroxide, all boiled for several minutes.
The reaction with copper: CaS2O3 + 4Cu + H2O -- 4CuO + CaS + H2S