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<p>[QUOTE=&quot;Dawnno, post: 611008, member: 10171&quot;]often &quot;dark&quot; = Sulfur exposure.&nbsp; so instead of reacting with O only, there&#039;s a &quot;sulfide&quot; group that attached to the alloy.</p><p><br /></p><p>so, looking that up, I just learned that:</p><p><br /></p><p>&quot;Organic sulphur-containing compounds, present in the materials of storage boxes, are another known source that can cause tarnishing.&quot;&nbsp;&nbsp; Also in foods, like onions and pickles.</p><p><br /></p><p><a href="https://www.ganoksin.com/article/gold-jewellery-tarnishing/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.ganoksin.com/article/gold-jewellery-tarnishing/" rel="nofollow">https://www.ganoksin.com/article/gold-jewellery-tarnishing/</a></p><p><br /></p><p>Hm.&nbsp; whodda thunk that.&nbsp;&nbsp; might be a wood preservative, perhaps?&nbsp; Paints?&nbsp; Should they have a legal warning: &quot;Caution: jewelry box may contain sulfur that damages your jewelry.&quot;&nbsp;&nbsp; Yeah, that&#039;ll sell.</p><p><br /></p><p>&quot;Recently, World Gold Council has had an opportunity to examine examples of blackened 22 carat gold returned to retailers in India. The analysis of the blackened layer has shown that it comprises silver (and copper) sulphide. This is a true tarnish layer. That such high carat golds should tarnish is unexpected and points to the jewellery being exposed to a particularly ‘corrosive’ environment at some stage. Perhaps, it is due to being worn during food preparation (some foods &amp; spices are very high in sulphur compounds). &quot;[/QUOTE]</p><p><br /></p>

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