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Message:: [QUOTE="I_v_a_n, post: 2519840, member: 81539"]Alok Verma,This is another story with the copper coins. My best copper coins obtained from Earth by detectorists I have send for dry cleaning to professionals on this field. But it was expencive coppers from several hundreds dollars to more than thousand.But for simple coins there are a very good method I use a lot of times. But I do not recomend it for ancient coins! For 100-200-300 years coins it's OK, but for millenium age coins I think only about dry cleaning.You'll need a piece of soap and a week of patience <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />This soap must containe Trilon B (I do not know if it correct in english - EDTA or ethylenediaminetetraacetic acid). It is necessary to take a knife and planed soap into a container in the form of small chips. Fill it with hot water and mix to soap is dissolved. Then drop a coin into the solution. After some time, the solution freezes and becomes a jelly. Forget about the coin on the half of the day, then pull, rub under running water by trimmed toothbrush and put it back into the solution by other side. After 1-2 days, when solution becomes green, prepare a new solution.This method have a good proven results. The method is very gentle and slow, you can always stop at some intermediate position. This method will remove green oxides and keep safe your brown patina.I have no photo before, only scan after cleaning. This is a rare coin. Who is interested in Russian coins see on Edge. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[ATTACH=full]537088[/ATTACH] [ATTACH=full]537089[/ATTACH] [ATTACH=full]537090[/ATTACH][/QUOTE]

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