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<p>[QUOTE=&quot;evelyb30, post: 9467554, member: 36&quot;]Or just use your 18k acid on a testing stone and a little experience.&nbsp; Scratch some metal onto the stone and hit it with the acid.&nbsp; The metal, if silver, will &quot;curdle&quot; up and turn white/gray.&nbsp; Silver plate will react almost immediately, and the longer the reaction takes the lower the silver purity is.&nbsp; It&#039;s no good for exact measurement but it will give you a good idea.[/QUOTE]</p><p><br /></p>

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