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<p>[QUOTE=&quot;GDJMSP, post: 36483, member: 112&quot;]Yours is an opinion shared by many and usually a good rule of thumb. And it applies to all forms of toning, not just rainbow or the darker grey commonly found on silver coins.</p><p><br /></p><p>But consider what causes toning - humidity, air content, storage medium etc. So if a coin is stored under ideal conditions - it will not tone. Take this coin for example - </p><p><br /></p><p><img src="http://www.gdjmsp.cointalk.org/coin_pics/1650-I%20half%20ECU%20ms64%20obv.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p><img src="http://www.gdjmsp.cointalk.org/coin_pics/1650-I%20half%20ECU%20ms64%20rev.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>Over 350 yrs old and yet toning is barely present. And the coin still exhibits full mint luster in all areas. </p><p><br /></p><p>Is it possible this coin was dipped ? Certainly - anything is possible. But if it was, it was a perfect job and only happened once many years ago. But I doubt it for there is still evidence of old, original toning that would have been removed and the luster would have been impaired had the coin been dipped.</p><p><br /></p><p>So it is possible to fine very old coins without significant toning. But it doesn&#039;t happen very often.[/QUOTE]</p><p><br /></p>

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