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<p>[QUOTE=&quot;Victor_Clark, post: 24897444, member: 10613&quot;]Any treatment for BD could possible change the way the patina looks; so I always start with as mild a treatment as possible. I first start with sodium carbonate and mix a bit into water (just enough that dissolves completely...if it falls out of solution, it&#039;s too much) and begin soaking. Check frequently and scrub with a toothbrush/ denture brush and rinse and repeat until it looks like all the BD is gone. You will probably notice the water changing color during the soaks; which is normal. As long as the patina is not stripping, I would probably soak for at least a week. Once it looks like the BD is completely gone, I rinse and scrub the coin thoroughly and put in the oven on low heat for a while, to make sure the coin is moisture free. You will need to keep on eye on the coin in case the BD comes back.</p><p><br /></p><p><br /></p><p><br /></p><p>I use washing soda for sodium carbonate, like below.</p><p><br /></p><p>[ATTACH=full]1599775[/ATTACH][/QUOTE]</p><p><br /></p>

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