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<p>[QUOTE=&quot;evelyb30, post: 7240741, member: 36&quot;]You&#039;re better off scratch testing with the 18k acid anyway.&nbsp; The results are a lot easier to read.&nbsp; Just scratch on the stone in the usual way.&nbsp; Hit the stripe on the stone with the 18k and the metal should turn white and curdle up.&nbsp; I bought one bottle of sterling acid and it went bad within a month or two. Some of my gold acids are years old and they work fine.[/QUOTE]</p><p><br /></p>

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