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<p>[QUOTE=&quot;evelyb30, post: 10424430, member: 36&quot;]My first kit&#039;s silver acid went bad quickly. I&#039;ve used the 18k for testing ever since. You can get a good guesstimate of silver fineness with it once you&#039;ve seen the reactions, if not something solid enough to &quot;say so&quot; in a listing.&nbsp; The speed of the reaction is key; the faster the test metal turns blue/white and curdles up, the purer the silver is. Silverplate is lightning quick, because it&#039;s often pure silver.&nbsp; The 18k eats through non-silver almost immediately.&nbsp; Real professionals don&#039;t use silver acid; it&#039;s too unreliable.[/QUOTE]</p><p><br /></p>

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