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<p>[QUOTE="Helvetica, post: 4967740, member: 75944"]You may be able to seal it using a Dremel with a conical or cylindrical felt attachment with a tiny smear of Renwax. That can often sort of burns in the surface of the bronze disease and stop it from spreading. Plus, using the conical felt attachment and a tiny smear of Renwax brings out some details of the coin.</p><p>If you feel it is hopeless anyway, you could try a teaspoonful of Natrium Hexametaphosphate in 3-4 teaspoonsful of cold water in a <u>non-plastic</u> saucer, small jar or similar. The mixture gets hot on its own and can melt plastic containers such as yoghurt beakers. Use tweezers to remove the coin from the mixture after a few hours or overnight and rinse very well in cold water, brush it with an old, cut-down toothbrush. Repeat if necessary. Natr. Hex. does not damage the patina of coins. Note: it is NOT the same as salt, which will eat your coin and spit out dust... Never use salt on coins!![/QUOTE]</p><p><br /></p>
[QUOTE="Helvetica, post: 4967740, member: 75944"]You may be able to seal it using a Dremel with a conical or cylindrical felt attachment with a tiny smear of Renwax. That can often sort of burns in the surface of the bronze disease and stop it from spreading. Plus, using the conical felt attachment and a tiny smear of Renwax brings out some details of the coin. If you feel it is hopeless anyway, you could try a teaspoonful of Natrium Hexametaphosphate in 3-4 teaspoonsful of cold water in a [U]non-plastic[/U] saucer, small jar or similar. The mixture gets hot on its own and can melt plastic containers such as yoghurt beakers. Use tweezers to remove the coin from the mixture after a few hours or overnight and rinse very well in cold water, brush it with an old, cut-down toothbrush. Repeat if necessary. Natr. Hex. does not damage the patina of coins. Note: it is NOT the same as salt, which will eat your coin and spit out dust... Never use salt on coins!![/QUOTE]
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