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<p>[QUOTE="John Burgess, post: 8170297, member: 105098"]first things first, and that's knowing what metal or alloy you are dealing with.</p><p>After that distilled water or Acetone is relatively harmless. it's 7 pH in both cases, just change your (solvent) cleaning fluid, whether acetone or distilled water when it's dirty, and rinse with fresh solvent so no deposits get left behind. </p><p>so, your coin is 1 Thai Baht and it's a copper nickel composition.</p><p><br /></p><p>The one thing to remember is you want to stay as close to a neutral 7 pH as you can and when you wander from 7, you don't wander far, too acid or too alkaline will cause damage to the coin in either case.</p><p><br /></p><p>Most people use distilled water or acetone to remove surface contaminants before storing their coins, it does nothing to toning, and may or may not work on various adhesives, and won't damage the coin either (except acetone can break down given the right conditions, of sunlight and water. a fragment of the molecule can become acetic acid, The acetic acid may gradually corrode any copper that stays in contact with the acetone mixture. if it breaks down. the acid will react with the copper and create a metal salt (Cupric sulfate possibly? I'm not a chemist by any stretch of the imagination, so I might have it wrong) </p><p>BUT, It's avoidable, by changing your cleaning solution regularly though, and using fresh, uncontaminated acetone.</p><p><br /></p><p>this isn't going to change the surfaces, it might dissolve organic compounds or minerals deposited on the coins surface into the solvent, that's about it, but you don't want to be cheap and keep reusing the same acetone over and over and never changing it out or mix water with it, or leave it in the sun to break down. </p><p><br /></p><p>I do recommend practicing on coins that are worthless, in case bad results happen. I also recommend making SURE the coin is about worthless before proceeding on your first shot at it.[/QUOTE]</p><p><br /></p>
[QUOTE="John Burgess, post: 8170297, member: 105098"]first things first, and that's knowing what metal or alloy you are dealing with. After that distilled water or Acetone is relatively harmless. it's 7 pH in both cases, just change your (solvent) cleaning fluid, whether acetone or distilled water when it's dirty, and rinse with fresh solvent so no deposits get left behind. so, your coin is 1 Thai Baht and it's a copper nickel composition. The one thing to remember is you want to stay as close to a neutral 7 pH as you can and when you wander from 7, you don't wander far, too acid or too alkaline will cause damage to the coin in either case. Most people use distilled water or acetone to remove surface contaminants before storing their coins, it does nothing to toning, and may or may not work on various adhesives, and won't damage the coin either (except acetone can break down given the right conditions, of sunlight and water. a fragment of the molecule can become acetic acid, The acetic acid may gradually corrode any copper that stays in contact with the acetone mixture. if it breaks down. the acid will react with the copper and create a metal salt (Cupric sulfate possibly? I'm not a chemist by any stretch of the imagination, so I might have it wrong) BUT, It's avoidable, by changing your cleaning solution regularly though, and using fresh, uncontaminated acetone. this isn't going to change the surfaces, it might dissolve organic compounds or minerals deposited on the coins surface into the solvent, that's about it, but you don't want to be cheap and keep reusing the same acetone over and over and never changing it out or mix water with it, or leave it in the sun to break down. I do recommend practicing on coins that are worthless, in case bad results happen. I also recommend making SURE the coin is about worthless before proceeding on your first shot at it.[/QUOTE]
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