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<p>[QUOTE=&quot;desertgem, post: 1489327, member: 15199&quot;]Theoretically silver would be more reactive on sulfur and similar. Practically, I am not sure if one would notice a significant difference as long as they were as or more reactive than the coins it is protecting. Another variable I just called another chemistry professor to discuss is once the initial layer of reactant is formed ( patina ) is copper compounds more protective than the corresponding silver patina in preventing further combination. The &quot;protection rate&quot; curve. Neither of us were sure, and he is leaving for a vacation in Minn., so I will leave that for a later investigation. Copper is so much cheaper than silver, I use them as I can get them for face, but silver would be as good or better, as both work better than other choices, but humidity still has to be controlled in both cases. IMO.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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