Daniel is doing his homework at last, writing a very small dictionary. In order to make this task more bearable he has been trying to engage me in conversation, which is why I have gone to hide upstairs with the computer for a bit. Latest topic was
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So will concentrated nitric acid. I've even cleaned them with aqua regia too (but that is a little on the overkill side as it will eat through the coins too). Any concentrated acid will do.
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