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<p>[QUOTE=&quot;desertgem, post: 1135508, member: 15199&quot;]If I might add my little bit to Doug&#039;s well defined answer about dipping. I dilute the dip with distilled water before using and then discard after use. If there is just a small amount of UT ( ugly tone/corrosion), I dilute it 1 part dip : 9 parts distilled water. If it is deeper than that, medium or dark grey, I use a 1:4 ratio. Only on hideous would I use full strength.&nbsp; The dip is a combination of sulfuric or other acid and a compound such as thiourea. Diluting with distilled water increase the time the action takes. Full strength, you can go beyond the endpoint in a few seconds. Diluted , you can watch the effects and not be rushed to stop the action of the acid. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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