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<p>[QUOTE=&quot;John Burgess, post: 7803470, member: 105098&quot;]90% gold can tone, because it has 10% copper., even even .9999 fine gold can tone, but it&#039;s rare and takes a long while. longer than the .900 fineness. I&#039;ve seen ti from an orangish yellow heading towards and orangish red on 90%.</p><p>&nbsp;if anything a bright yellow would be an indication of a possible dipping and not quite right for it&#039;s age. possible, but even just minted the 90%ers dont&#039; go the shade of yellow that dipping will cause sometimes.</p><p><br /></p><p>the picture posted so far looks like good, honest toning to me.[/QUOTE]</p><p><br /></p>

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