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<p>[QUOTE=&quot;purple88, post: 1821183, member: 56032&quot;]I found an article in the journal &#039;Protection of Metals and Physical Chemistry of Surfaces&#039; entitled &#039;Corrosion resistance of Zambian silver coin from the &quot;African Wildlife&quot; series&#039; that appears to address the same subject matter discussed by GDJMSP.&nbsp; And the authors use a series I collect as an example... yee haw! </p><p><br /></p><p>Abstract follows:</p><p><br /></p><p>The surface of Zambian silver coin from the “African Wildlife” series is studied by local X-ray fluorescent analysis, mass-spectrometry, and electrode potential measurements. High purity of the coin metal is pointed out. Faint yellow tarnish at some spots on the surface is caused by local contamination during the coin production or storage.</p><p><br /></p><p>[/QUOTE]</p><p><br /></p>

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