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<p>[QUOTE=&quot;evelyb30, post: 10685822, member: 36&quot;]Old farts like me use a black scratch &quot;stone&quot; and 18k gold acid.&nbsp; I scrape the silver-colored metal on the stone until there&#039;s enough to see easily.&nbsp; Drop on a bit of the acid. It tends to be easier to read.&nbsp; WHen applied to a silver scratch the metal turns blue-white and &quot;curdles&quot;.&nbsp; Pure silver ( often silverplate) reacts almost immediately.&nbsp; Sterling takes longer and lower percentages take longer still. It&#039;ll just eat through brass or pewter .&nbsp; Silver acid tends to stop working properly and can be hard to read even when it does.[/QUOTE]</p><p><br /></p>

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