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<p>[QUOTE=&quot;Any Jewelry, post: 9574232, member: 2844&quot;]You have to be able to assess the colours and subtle differences, but even then it is not an exact science. </p><p>A side by side test with a known piece helps, as Lucille said. But helping is not exact either.</p><p><br /></p><p>I always look at the acid drop from the side, against daylight. That gives you a better idea of the colour than looking at it straight on (from above).</p><p>As Holly said, the unglazed back of a white tile should also give you a better idea of the colour.[/QUOTE]</p><p><br /></p>

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