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<p>[QUOTE=&quot;Just Carl, post: 167157, member: 4552&quot;]This is exactly what a coin looks like from acidic reactions. In chem classes it is really common to experiment with coinage and acids mostly due to the ability to acquire concentrated versions of solutions of things like Sulfuric, Floric, Nitric, Hydrochloric, etc. Then there is always the experiment with gold if you can afford it making Aqua Regia and placing Gold in it to see if dissolve. Just have to put old copper cents in Sulfuric to make Copper Sulfate and then form the blue crystsal. </p><p>Actually it is known that unless you rotate the coin in the acid one side will get more of the reaction than the other and that is a trick since we have to use glass type forcepts to turn it over. Also, never wipe the coin on your shirt sleeve.[/QUOTE]</p><p><br /></p>

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