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<p>[QUOTE=&quot;Pavlos, post: 3198416, member: 96635&quot;]Even to other alloying metals in elemental form like copper (diluted) citric acid won&#039;t react in such a short time, only to its oxides or for example metal sulfides. We are also talking about an alloy, the behavior of the metals are different then when they are separated. The metals are homogenous mixed and the layers of metal can not slide from eachother. On the end almost all metals do react but in a&nbsp; very long exposure time, a process called corrosion, I think many people are familiar with it. Carbon dioxide from the atmosphere with moisture will make a weak acid which causes together with oxidization of the metal these beautiful patina&#039;s on for example bronze coins.</p><p><br /></p><p>In other words, lemon juice i.e. citric acid or vinegar i.e. acetic acid can be used without problems to clean silver coins for a short period. It will brighten the metals because the oxides and sulfides are getting removed.[/QUOTE]</p><p><br /></p>

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