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<p>[QUOTE=&quot;BAJJERFAN, post: 2130928, member: 74330&quot;]IIRC I used the common ordinary 28% Mallinckrodt material. I used it both right out of the bottle and diluted with water. Tried it at room temp and with heat. No removal of the silver chloride residue and no apparent effect on the coin from what I could tell. I also tried using dilute sulfuric acid with no luck. Adding hydrogen peroxide to the acid solution was ineffective. Made up some Caro acid aka piranha solution from the H2O2 and conc sulfuric acid. Diluted that with water and still no luck taking the milk spots off.[/QUOTE]</p><p><br /></p>

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