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<p>[QUOTE=&quot;4to2centBC, post: 2443201, member: 76181&quot;]yup. </p><p><br /></p><p>but that seems dilute.&nbsp; You get a brown solution which must react with and precipitate on the surface. I am guessing the carbon adds color or perhaps fixes the surface (i.e. stops the reaction)[/QUOTE]</p><p><br /></p>

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