About those blue-toned Lincolns
Mercfan
Posts: 700 ✭✭
I've found a bunch of them in with some loose coins that came to me as part of the Syracuse Hoard, and I really like their appearance.
For the chemists and metallurgists out there: What chemical process causes an otherwise ordinarily browning wheat cent to take on those fabulous blue-on-brown hues?
For the chemists and metallurgists out there: What chemical process causes an otherwise ordinarily browning wheat cent to take on those fabulous blue-on-brown hues?
"Coin collecting problem"? What "coin collecting problem"?
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