Acetone will remove the tape residue but it should be done as soon as possible. If any toning is occuring (and toning is always occurring slowly)...
Sorry double post.
Sample size is really too small to come to any real judgement, not enough data points. If you want to make a really valid test send the same coin...
Standard question, how magnetic is it? Does it JUMP to the magnet from a half inch away and hold tight, or does a magnet just pick it up and it...
I assume MWR means Mint Wrapped Roll. As far as I know the mint doesn't sell rolls of mixed dates so I guess you mean bank wrapped roll.
The floors were smooth cement and had a open grate type system that allowed gold dust to settle down through it, and acted as a scraper to scrape...
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