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<p>[QUOTE=&quot;-jeffB, post: 4060790, member: 27832&quot;]Well, as long as the thread&#039;s alive <i>now</i>...</p><p><br /></p><p>I&#039;m kinda baffled that anyone thinks MS70 would be &quot;uncovering natural purple toning that was already there under the brown&quot; rather than just &quot;turning the coins purple&quot;. I&#039;d suggest two experiments with, oh, say, cheap Lincolns:</p><p><br /></p><p>1) Take a few brown coins, and soak <b>half of each one</b> in MS70. See which ones turn purple. Now, take those, apply <i>any other treatment you like</i> to the untreated half, and see if it &quot;uncovers&quot; that purple color.</p><p><br /></p><p>2) Take a few bright red coins, and soak <b>half of each one</b> in MS70. See if any turn purple. Nothing &quot;under&quot; anything &quot;to be revealed&quot; there. For extra credit, try the same with those other treatments from experiment (1).[/QUOTE]</p><p><br /></p>

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