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<p>[QUOTE=&quot;Roerbakmix, post: 7298582, member: 100731&quot;]Cleaning coins can be rewarding, but sometimes, it can be frustrating. In general, I find bronze coins much harder to clean than silver ones: with chemical treatment, usually the deposits dissolve while the silver remains unharmed. For bronze coins, you have to take care not to dissolve the underlying bronze. </p><p><br /></p><p>Here are a couple of fails:</p><p><i>Bernhard I (973-1011) with some copper deposits. The coin was very shiny afterwards.</i></p><p>[ATTACH=full]1276737[/ATTACH]</p><p>[ATTACH=full]1276738[/ATTACH]</p><p><br /></p><p><br /></p><p><i>This one still haunts me. A Menander drachm, one of my first cleaning projects. It took me hours to remove the deposits (looking back, these deposits were likely horn silver and would have dissolved easily in sodium thiosulphate). Afterwards, the coin was shiny silver, and I decided to apply elemental Sulphur to retone it somewhat. I warmed it in the oven </i><u><i>and forgot about it...</i> </u><i>Twenty minutes later, there were thick layers of molten Sulphur that quickly hardened and had to be removed mechanically. </i></p><p>[ATTACH=full]1276739[/ATTACH]</p><p>[ATTACH=full]1276740[/ATTACH]</p><p><br /></p><p><i>Garbage in = garbage out. Trajan Decius antonianus was rough, but the pits were masked with grime. After removal, I ended up with a pitted coin. </i></p><p>[ATTACH=full]1276741[/ATTACH]</p><p>[ATTACH=full]1276742[/ATTACH][/QUOTE]</p><p><br /></p>

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