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<p>[QUOTE=&quot;The Beatles, post: 1640433, member: 41968&quot;]I was recently given some no-date Buffalo Nickels. I kept trying to find a way to clean it just to see the dates (these are some pretty banged up coins, for those of you wondering). Well, all I did was sit the nickels in a little bit of vinegar to begin eating at the coins (it&#039;s working so far! <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" />). I went to look at the coins to see their progress, and noticed that the vinegar was turning a slightly blue color. I figure the acid is reacting to something in the composition of the nickels, but I am unsure what part would be creating this. So I have two questions to ask you:</p><p>1. What is creating this bluish tint in the vinegar?</p><p>2. What is this blueish color? I think it is a chemical compound, but want some expert input.[/QUOTE]</p><p><br /></p>

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