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what metal doesn't cause the acid to change color?
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<p>[QUOTE="udoittwo, post: 308295, member: 1916"]Just to be sure the acid hadn't gone bad or anything was off, I did the same test on something that I know is sterling and the acid worked as it should. </p><p><br /></p><p>I JUST put another drop in the bowl and left it there for a few minutes then it finally turned gray and etched the bowl.</p><p><br /></p><p>Just curious, any idea of the life span of these acids? Once a year, I replace them. Is that to often or not often enough?</p><p><br /></p><p>To Poisonivy, I have had no problems with the basic kits sold on Ebay. Silver acid, 10K, 14K, 18K, 22K, and the stone. I believe they can run from $10-20.</p><p><br /></p><p>Thanks again,</p><p>Karl.[/QUOTE]</p><p><br /></p>
[QUOTE="udoittwo, post: 308295, member: 1916"]Just to be sure the acid hadn't gone bad or anything was off, I did the same test on something that I know is sterling and the acid worked as it should. I JUST put another drop in the bowl and left it there for a few minutes then it finally turned gray and etched the bowl. Just curious, any idea of the life span of these acids? Once a year, I replace them. Is that to often or not often enough? To Poisonivy, I have had no problems with the basic kits sold on Ebay. Silver acid, 10K, 14K, 18K, 22K, and the stone. I believe they can run from $10-20. Thanks again, Karl.[/QUOTE]
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