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<p>[QUOTE=&quot;Any Jewelry, post: 236717, member: 2844&quot;]The purpose of lemon juice is a reaction with the calcium in the coral, it bubbles. Do it at the back.</p><p>Or leave it in milk for a couple of hours, red coral will colour the milk.</p><p>But my favourite is simply a more detailed picture of the stone, no risks involved. Just place it on a white piece of paper and take a picture close enough so we can see if there are lines in the coral, or other details.</p><p>It doesn&#039;t have to be glass though, I am thinking an early plastic.[/QUOTE]</p><p><br /></p>

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