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<p>[QUOTE=&quot;evelyb30, post: 4411871, member: 36&quot;]The electronic ones are Nut$o prices. Good gem testers too.&nbsp; I have a cheap diamond tester that gives me enough information to start from, but it&#039;s nothing to recommend to anyone else.&nbsp; The acids?&nbsp; Look for Youtube videos; the instructions are out there.&nbsp; The 18k will eat right through pot metal or pewter.&nbsp; If it&#039;s lower grade silver the mark will &quot;curdle&quot; at a slower rate, and with practice it&#039;s good enough for a guesstimate at metal fineness.&nbsp; </p><p><br /></p><p>If you scratch something and the scratch looks reddish, odds are it&#039;s brass or copper and plated with something else.[/QUOTE]</p><p><br /></p>

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