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<p>[QUOTE=&quot;Eng, post: 1756691, member: 44227&quot;]spirityoda,</p><p>i only saw this done at a jeweler. So i bought 12kt acid and 22kt acid, silver acid, rubbed some line&#039;s on the black stone, as you see in the pic each coin had a few lines, just one drop and cross the lines. wait a couple minutes in pic #1 the acid didn&#039;t melt the gold off.</p><p>&nbsp;So i cleaned the stone off with a paper towel and a little water. ran a few lines again and went to 22kt acid which started to melt the gold lines off the stone, no bubbles, did see some smoke, i would say it was 18 to 20kt.,what i understand the purer the gold or silver, the higher the acid content you would need..i&#039;m no expert, but i would be careful with this.</p><p>&nbsp;This is acid and could rune most anything it got on...</p><p>&nbsp;Any input would be great...[/QUOTE]</p><p><br /></p>

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