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<p>[QUOTE=&quot;xlrcable, post: 2986070, member: 41288&quot;]I always found MS70 really effective for this, though if the formula has changed I don’t know which version I was using.</p><p><br /></p><p>More recently I’ve been using a sodium hydroxide solution, of about the strength people use for making pretzels. The thought was that NaOH isn’t that different from KOH (one of the ingredients in MS70) and that I’d rather expose a coin to one agent than several if the result is the same. I’m certainly not urging this treatment on the OP, but if there are any other mad experimenters about with hazy 1970s proofs - well, it’s working as well as MS70 did for me.[/QUOTE]</p><p><br /></p>

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