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<p>[QUOTE=&quot;medoraman, post: 1733881, member: 26302&quot;]Yeah, many a lincoln has been ruined and turned blue forever by beginners &quot;improving&quot; a coin. Blue is actually the telltale color of many types of cleaners. The residue eventually turns the cent blue, making past bad clean job plainly evident.</p><p><br /></p><p>From an ancient collector point of view, blue IS a viable natural toning color. Its much more likely on brass than bronze, and the coins had to have been buried in a very tightly sealed container and some very special conditions apply. Blue is the rarest natural toning color there is for ancients, and a shiny hard blue toned coin is VERY desirable, and VERY expensive.</p><p><br /></p><p>I have seen hard blue patina develop on lincoln and IHC with coins that were buried in the ground. Rare, but it does happen. I know they weren&#039;t AT since it was a hard patina and I helped dig them out of the ground!</p><p><br /></p><p>Btw yes there is a was to AT a coin blue and not have to apply a chemical. However, why do you want to? Any lincoln that is blue will immediately tell a cent expert it was either buried, (and you will notice no hard patina so that is ruled out), chemically altered or AT. Blue simply does not normally occur on cents without some special conditions present, and those special conditions leave signatures.[/QUOTE]</p><p><br /></p>

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