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<p>[QUOTE="illini420, post: 681450, member: 19423"]Gold coins can and do tone. Pure gold 24k shouldn't tone, but most U.S. gold coins are only 90% gold w/ 10% copper. The inclusion of the copper in the mix does allow gold to tone, sometimes quite beautifully, though not as often or as wildly as silver tones. The spotting that is sometimes seen on gold is also due to the copper in the mix. A couple of months ago Mark Feld had a great looking 1909 incuse Indian gold with some toning, didn't save a picture of that one though.[/QUOTE]</p><p><br /></p>
[QUOTE="illini420, post: 681450, member: 19423"]Gold coins can and do tone. Pure gold 24k shouldn't tone, but most U.S. gold coins are only 90% gold w/ 10% copper. The inclusion of the copper in the mix does allow gold to tone, sometimes quite beautifully, though not as often or as wildly as silver tones. The spotting that is sometimes seen on gold is also due to the copper in the mix. A couple of months ago Mark Feld had a great looking 1909 incuse Indian gold with some toning, didn't save a picture of that one though.[/QUOTE]
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