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<p>[QUOTE=&quot;-jeffB, post: 3613353, member: 27832&quot;]Nitric or sulfuric acid definitely <i>won&#039;t</i> leave the zinc.</p><p><br /></p><p>It looks like the Mathers and Martin method uses sodium polysulfide, which you make from sulfur and lye. I&#039;ve also seen references to a method using calcium sulfide, which I guess you&#039;d make from lime and sulfur. I may give one of those a try once it cools off. (I&#039;m NOT doing a sulfide reaction indoors.)[/QUOTE]</p><p><br /></p>

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