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<p>[QUOTE=&quot;IvaPan, post: 9485443, member: 78949&quot;]Although not experienced, just to say that I went several times to a trusted jeweller and he did just what Ruth and Aqui said, looks pretty easy. He just rubbed the piece hard on the testing stone to leave a visible trace, and then brushed the trace with a small brush, soaked in the acid.</p><p><br /></p><p>The harder part, I would guess, comes when one should read the results, especially when only one acid type is used.&nbsp; It definitely requires some knowledge and practice.[/QUOTE]</p><p><br /></p>

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