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<p>[QUOTE=&quot;Midas, post: 120269, member: 2761&quot;]Forgot to add:</p><p><br /></p><p>Copper and silver will tarnish in reaction with hydrogen sulphide, a pollutant given off by decaying animal matter (which is naturally present in the atmosphere). However, some paints, textiles and other household materials also emit some sulphur-containing organic compounds and these also cause copper and silver to tarnish.</p><p><br /></p><p>That is why copper and silver are not NOBLE metals like Au, Pt, and Pd which are metals that do not tarnish or oxidize.[/QUOTE]</p><p><br /></p>

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