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My 1924 Peace, why the dark color ?
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<p>[QUOTE="Insider, post: 2458558, member: 24314"]I use full strength and it will often lighten the surface a little but another trick will get it back to normal - BUT Blast clean. If acetone is used after the 70, the coin may turn blue. So MS-70 needs to be removed from the coin with HOT, SOAPY water.</p><p> </p><p><span style="color: #b30000">WARNING:</span> If a copper coin has any "red spots" (NOT mint red luster) from corrosion products the MS-70 will make them stand out which is not desirable! You'll need to work around them or conserve the coin another way.[/QUOTE]</p><p><br /></p>
[QUOTE="Insider, post: 2458558, member: 24314"]I use full strength and it will often lighten the surface a little but another trick will get it back to normal - BUT Blast clean. If acetone is used after the 70, the coin may turn blue. So MS-70 needs to be removed from the coin with HOT, SOAPY water. [COLOR=#b30000]WARNING:[/COLOR] If a copper coin has any "red spots" (NOT mint red luster) from corrosion products the MS-70 will make them stand out which is not desirable! You'll need to work around them or conserve the coin another way.[/QUOTE]
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My 1924 Peace, why the dark color ?
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