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I was just asked how to reverse the blue color of MS-70 on copper...

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... and don't know the answer (shrug) .


A client has an 1820 Randall coin that he now believes got its blue color from having been MS70-ed. It is certified MS-64 with a "BN" designation, but he want's to revert the color from blue to actually being brown again.


How is this done? Can the MS70 be rinsed off, or can acetone remove it?


He intends to crack it out if the process can be reversed; otherwise, he'll dump it.



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Tell him he is insane. Blue is beautiful.


If he still insists on removing the blue color, he can coat the coin in oil (this works for removing the pink color of cleaned copper also) or I have been told he can use a camel hair brush.

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