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<p>[QUOTE="GDJMSP, post: 980945, member: 112"]There is one thing I forgot to mention - the answer to the original question. Dipping works by removing a very thin layer of metal from the coin. Layer is not even the right word, but it expresses the meaning better than most other words. And it does this because coin dips all contain an acid - thiourea. It is this acid that disolves the top molecules of the silver that are toned and washes them away thus revealing the untoned silver underneath.</p><p><br /></p><p>You see, toning is not something that sits on top of the metal. Toning is the metal itself that has been altered by a chemical reaction. So the only way to remove toning is to remove the affected metal.[/QUOTE]</p><p><br /></p>
[QUOTE="GDJMSP, post: 980945, member: 112"]There is one thing I forgot to mention - the answer to the original question. Dipping works by removing a very thin layer of metal from the coin. Layer is not even the right word, but it expresses the meaning better than most other words. And it does this because coin dips all contain an acid - thiourea. It is this acid that disolves the top molecules of the silver that are toned and washes them away thus revealing the untoned silver underneath. You see, toning is not something that sits on top of the metal. Toning is the metal itself that has been altered by a chemical reaction. So the only way to remove toning is to remove the affected metal.[/QUOTE]
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