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<p>[QUOTE=&quot;Brian Warshaw, post: 3351524, member: 16674&quot;][USER=301]@komokwa[/USER] You&#039;ve answered a question I was going to ask; bonded gold.</p><p><br /></p><p>I bought this brooch for €2 so that I could play with my newly acquire &#039;no light&#039; light, and cheap home testing.</p><p><br /></p><p>I dunked part of the brooch in 70 white vinegar for about 15 minutes, with no tarnishing of the gold, however, there a small patches where the gold is missing, and there was no reaction from the vinegar either.&nbsp; I don&#039;t understand the latter, except it is obviously not silver.&nbsp; I did actually think of the gold being bonded, not because I had heard of it, I felt it when I ran my fingernail over the bare area.</p><p><br /></p><p>The stone, which I thought might be a pink opal is translucent, but offers no reaction from the UV light, which, is not unnecessary bad as I have read if the iron content is above 3000 ppm no reaction is to be expected. </p><p><br /></p><p>Why no tarnishing from the base metal, vinegar should have caused this, it certainly does wonders for my pickled onions.</p><p><br /></p><p>[ATTACH=full]299892[/ATTACH] </p><p>[ATTACH=full]299893[/ATTACH] </p><p>[ATTACH=full]299891[/ATTACH] </p><p><br /></p><p>Did I overpay?&nbsp; It was a charity shop.[/QUOTE]</p><p><br /></p>

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