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<p>[QUOTE=&quot;desertgem, post: 2549664, member: 15199&quot;]No, I am not saying that. If the dipped coin was put into a bowl of still water , then the acid would still be in the solution. But if rinsed with flowing water, the acid should be removed along with any thiourea or what ever the dip used to carry the silver compound(s) producing the corroded( toned or damaged) areas on the coin away also, and no buffering is needed IMO.</p><p><br /></p><p>As far as baking soda, if it is not completely removed before (physically) drying with a cloth or whatever, it can be abrasive if the person doesn&#039;t know solubility. Harbor Freight and such sell air abrasive set ups for paint removal,, and they use sodium bicarbonate ( not mixed with water though).[/QUOTE]</p><p><br /></p>

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