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<p>[QUOTE=&quot;Bronwen, post: 9542048, member: 5833&quot;]Another is that vinegar can dissolve calcium carbonate, of which coral is made.&nbsp; Ketchup helps keep the vinegar from flowing around unconstrained, but if you&#039;re going to do this, maybe better to cover the coral with Vaseline, cold cream, something that will stay in place &amp; keep the vinegar out.&nbsp; And moisturize the coral.</p><p><br /></p><p>I agree with the consensus that your cameo is real coral, although probably dyed, which is more common than not.&nbsp; Of all the natural materials used for cameos, I would say coral is the easiest to fake visually.&nbsp; Glass can be especially convincing because, unlike plastic, it is dense, &amp; can be made to have color variability the way some coral does.&nbsp; Tested against the teeth, as one tests pearls, glass is, you guessed it, glassy, with a brighter sound than coral produces when tapped against the teeth.</p><p><br /></p><p>Plastic is often hollow &amp; sounds that way when tapped with a fingernail.&nbsp; Plastic can look good until you pick it up &amp; feel how light it is.&nbsp; It is also unnaturally smooth against the teeth.</p><p><br /></p><p>Since both plastic &amp; glass are molded, the lines tend to be softer, more rounded than usually seen in a hand-carved piece.</p><p><br /></p><p>These are all fake:</p><p><br /></p><p>[ATTACH=full]453727[/ATTACH][/QUOTE]</p><p><br /></p>

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