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<p>[QUOTE=&quot;Any Jewelry, post: 9430118, member: 2844&quot;]No need for gloves, you only use one drop at a time,straight from the bottle on the testing stone.</p><p>The bottles of acid are small, and you get a set for different karatages/finenesses.</p><p><br /></p><p>As kyra said, you rub the gold on the testing stone. It leaves a stripe.</p><p>Next you take a bottle of testing acid, and place one drop on the stripe. If the gold stripe dissolves under the drop of acid, try the acid for a lower karatage.</p><p>When the stripe stays as it is in spite of the acid, it is at least the right fineness, maybe higher. That is why you have different bottles, to see which one comes closest.[/QUOTE]</p><p><br /></p>

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