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<p>[QUOTE=&quot;Just Carl, post: 99543, member: 4552&quot;]Actually it&#039;s H2SO4, Sulfuric Acid, that reacts with copper the best. Sorry the 2 and 4 should really be down a little if using scientific otations. The H2SO4 reacts and creates CuSO4 and the H is given off as a mild gas or with an abundance of O becomes part of the solution. If allowed to evaporate, there is a blue crystaline substance left on the bottom which is used as a vegatation killer. As to the coin if does appear to have been given a bath in such an acid. It is commonly found in auto batteries and many kids do try just that dipping for the fun of it. Since the battery acid is mild it can be a very controlled reaction. The electrolite process is also a lot of fun and if done correctly can produce some strange looking coins. Typical college chem lab items. No extra credit though.[/QUOTE]</p><p><br /></p>

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