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<p>[QUOTE=&quot;Bronwen, post: 4253441, member: 5833&quot;]I bought a kit &amp; have always been afraid to use it.&nbsp; The acid, although the bottles have not been opened, has probably lost its potency so is no good anymore.&nbsp; </p><p>that leaves me with a usable stone.</p><p><br /></p><p>The stone is used to take a streak of the metal from an inconspicuous place on the item being tested.&nbsp; You do not apply the acid directly to the object.&nbsp; You apply a drop of acid to a spot on the streak &amp; watch what happens.&nbsp; I&#039;m going to let others explain how to read the result.[/QUOTE]</p><p><br /></p>

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