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<p>[QUOTE=&quot;evelyb30, post: 2777114, member: 36&quot;]Silver acids go bad so fast most professional joolies don&#039;t even bother with them.&nbsp; We do a scratch test on a stone and use 18k acid instead.&nbsp; The mark &quot;curdles&quot; up and turns whitish if it&#039;s silver.&nbsp; The faster the change happens the purer the silver is. (100% silver like silverplate goes lightning quick)[/QUOTE]</p><p><br /></p>

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