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<p>[QUOTE=&quot;stracci, post: 4293280, member: 13814&quot;]I think 15 minutes is far too long. You should see red color developing within seconds when doing silver testing. Assuming your acid is fresh.</p><p>I think filing a notch is rather aggressive, and I have never done testing that way.</p><p>Perhaps that would be better used for serving pieces rather than jewelry.</p><p>If you read through the threads, you will see that you need to get a feel for acid testing. You may get results that are not clear cut. Sometimes silver purity might be 900 or 850. Then the test color will be more of a rust color, rather than red.</p><p>Keep trying, and good luck. And remember, acid can get old and may need replacing about once a year.[/QUOTE]</p><p><br /></p>

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