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<p>[QUOTE=&quot;V. Kurt Bellman, post: 2726844, member: 71723&quot;]Hey [USER=24314]@Insider[/USER], are you sure what&#039;s going on with clad coins in a commercial dip isn&#039;t just acid washing? Is the thiourea even taking part? I think that may be it. You can get whatever you&#039;re getting on cupronickel from the acid component, and without the thiourea, you might not have to deal with the pink copper problem. Careful modulation of the strength of the acid seems wise.[/QUOTE]</p><p><br /></p>

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