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Proof of principle: removing iron oxides from silver coins
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<p>[QUOTE="Roerbakmix, post: 7463852, member: 100731"]Thanks for the comments!</p><p><br /></p><p><br /></p><p><br /></p><p>In the end, lemon juice might have worked just as fine. However, it can take ages (for this coin, probably more than 2h of cleaning, compared to c. 10 minutes with HCl). </p><p><br /></p><p>Sodium thiosulphate is perfectly safe. It requires some experience though to pick coins that might benefit versus those that don't, i.e. there is no 'undo-button' with coin cleaning.[/QUOTE]</p><p><br /></p>
[QUOTE="Roerbakmix, post: 7463852, member: 100731"]Thanks for the comments! In the end, lemon juice might have worked just as fine. However, it can take ages (for this coin, probably more than 2h of cleaning, compared to c. 10 minutes with HCl). Sodium thiosulphate is perfectly safe. It requires some experience though to pick coins that might benefit versus those that don't, i.e. there is no 'undo-button' with coin cleaning.[/QUOTE]
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Proof of principle: removing iron oxides from silver coins
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