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<p>[QUOTE=&quot;Oldhoopster, post: 8524527, member: 84179&quot;]When I was in grad school, I used an atmosphere controlled box for my thesis. When I used ammonia, the copper tubing turned a similar shade of blue.&nbsp; If only toned coins were popular 35+ years ago, I&#039;m sure I could have been a coin doctor.&nbsp; Adjust the NH4 concentrations, add a little heat, maybe some low sulfur levels.&nbsp; A bell jar, vacuum pump and some NH4 or H2S for toning the coins in slabs, and I would have been in business. <b>Better coin collecting through chemistry</b></p><p><br /></p><p>Don&#039;t forget that that AT isn&#039;t necessarily <u>artificial </u>toning.&nbsp; It is real toning but highly <u>accelerated. </u>[/QUOTE]</p><p><br /></p>

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