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Treasure Hunting
Treasure, Coin and Relic
Nice old coin
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<blockquote data-quote="Wally69" data-source="post: 427686" data-attributes="member: 1916"><p>A citric acid bath might be the go with a light rub with bicarb. I have found some of my 1800s very hard to clean and needed multiple treatments. The results have been satisfying as a clean silver looks awesome.</p><p></p><p>With a few coins I have had no success completely removing a caked on black layer, suspect that is due to bushfires and a reaction to the 7.5% alloy in the coin. I have not treated them with stronger acids for fear of damaging them but I understand all silversmiths pickle their Stirling silver in acid to remove surface impurities prior to polishing, so I guess there would be a method that removes the black layer without too much damage.</p></blockquote><p></p>
[QUOTE="Wally69, post: 427686, member: 1916"] A citric acid bath might be the go with a light rub with bicarb. I have found some of my 1800s very hard to clean and needed multiple treatments. The results have been satisfying as a clean silver looks awesome. With a few coins I have had no success completely removing a caked on black layer, suspect that is due to bushfires and a reaction to the 7.5% alloy in the coin. I have not treated them with stronger acids for fear of damaging them but I understand all silversmiths pickle their Stirling silver in acid to remove surface impurities prior to polishing, so I guess there would be a method that removes the black layer without too much damage. [/QUOTE]
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Treasure Hunting
Treasure, Coin and Relic
Nice old coin
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