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Use chemistry to remove the copper plating on a penny

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 Or? combined: 3Cu + 2Ca(OH2) +3S -- 3CuO + 2CaS + H2S + H2O The new liquid reacts with copper: 2CaS + H2S + 3Cu -- 3CuO +? H2O Zinc is not attacked by calcium hydroxide (or by anything else here).
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