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<p>[QUOTE="1865King, post: 7413891, member: 103207"]I did an experiment using different chemicals to see how they would affect coins. I did one test using a similar product to Draino. I used a really crappy road rash Indian cent. After about 30 minutes in a diluted solution the Indian cent was partially dissolved with holes almost burned through it. I did tests with a number of chemicals all on junk coins. Most tests turned out as expected. Destroyed most coins. Draino type chemicals did the most damage in the least amount of time. Draino type chemicals are very strong caustic chemical. They will eat copper and aluminum coins. Not as bad on silver but, given enough time it will dissolve the coin. On the other end is the acids. Hydrochloric and sulfuric acids will have the same affect on copper and aluminum. However, it depends on how strong the acid is. Full strength say goodbye to the coins. Deluted acids depending on strength will remove toning if done fast. Leave a coin in the solution even if very mild it will eventually totally destroy the coin. Looking at the before and after of the Mercury dimes it looks like they were just dirty. That may have come off by just soaking them in a soapy solution over night and then a lite wipe. Being junk silver I wouldn't be concerned about if the coin looked like it was cleaned but, those are the type of coins to use if you want to do your own testing. There are plenty of junk foreign coins in buckets at most coin shops that a dealer will gladly sell you very cheaply to play with. Some dealers may let you grab as few to play with if you tell them your plans. Some dealers may even be interested in your results. This is how we learn what not to do.[/QUOTE]</p><p><br /></p>
[QUOTE="1865King, post: 7413891, member: 103207"]I did an experiment using different chemicals to see how they would affect coins. I did one test using a similar product to Draino. I used a really crappy road rash Indian cent. After about 30 minutes in a diluted solution the Indian cent was partially dissolved with holes almost burned through it. I did tests with a number of chemicals all on junk coins. Most tests turned out as expected. Destroyed most coins. Draino type chemicals did the most damage in the least amount of time. Draino type chemicals are very strong caustic chemical. They will eat copper and aluminum coins. Not as bad on silver but, given enough time it will dissolve the coin. On the other end is the acids. Hydrochloric and sulfuric acids will have the same affect on copper and aluminum. However, it depends on how strong the acid is. Full strength say goodbye to the coins. Deluted acids depending on strength will remove toning if done fast. Leave a coin in the solution even if very mild it will eventually totally destroy the coin. Looking at the before and after of the Mercury dimes it looks like they were just dirty. That may have come off by just soaking them in a soapy solution over night and then a lite wipe. Being junk silver I wouldn't be concerned about if the coin looked like it was cleaned but, those are the type of coins to use if you want to do your own testing. There are plenty of junk foreign coins in buckets at most coin shops that a dealer will gladly sell you very cheaply to play with. Some dealers may let you grab as few to play with if you tell them your plans. Some dealers may even be interested in your results. This is how we learn what not to do.[/QUOTE]
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