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<p>[QUOTE="-jeffB, post: 2504201, member: 27832"]Gold and platinum can sit in the elements for thousands of years without corroding. Sea water, acid and air would eventually attack them, but exposure to air, dampness (from non-salt water) and even sulfur won't do much if anything.</p><p><br /></p><p>I guess a wood fire could damage platinum, as hot alkali (like that found in wood ash) can eventually attack the metal, but that's a bit of a stretch.</p><p><br /></p><p>I think the only way you'll get "toning" on gold or platinum is if they're alloyed with something more reactive, or if there's some foreign deposit on the surface. [USER=70583]@jwitten[/USER] has shown quite a few toned gold coins here, but I think they're all "coin gold", that is, alloyed with copper and perhaps other things.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 2504201, member: 27832"]Gold and platinum can sit in the elements for thousands of years without corroding. Sea water, acid and air would eventually attack them, but exposure to air, dampness (from non-salt water) and even sulfur won't do much if anything. I guess a wood fire could damage platinum, as hot alkali (like that found in wood ash) can eventually attack the metal, but that's a bit of a stretch. I think the only way you'll get "toning" on gold or platinum is if they're alloyed with something more reactive, or if there's some foreign deposit on the surface. [USER=70583]@jwitten[/USER] has shown quite a few toned gold coins here, but I think they're all "coin gold", that is, alloyed with copper and perhaps other things.[/QUOTE]
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