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<p>[QUOTE=&quot;halfcent1793, post: 3055852, member: 86853&quot;]The blue color on the acetone-treated coins is the natural color of the toning. It got that way because you removed the oil on the surface. You can make it brown again by adding some oil, and you can turn it back by removing the oil. Adding and removing the oil have no effect on the coin itself, just the appearance of it. Unless, of course, you hairline the coin by brushing it.</p><p><br /></p><p>Also, NEVER, NEVER dip a copper coin in silver dip. Silver dips dissolve the copper and leave it microporous.[/QUOTE]</p><p><br /></p>

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