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Twenty Shades of Copper

2012-11-29 12:23:12 (читать в оригинале)

Grading copper coins can be one of the most difficult tasks a coin collector can encounter. One of the factors that are taken into consideration when grading copper coins (for example, Lincoln pennies) is the color of the copper. As copper comes in contact with air, water vapor and other chemicals the copper will Read Full PostTwenty Shades of Copper originally appeared on About.com Coins on Thursday, November 29th, 2012 at 08:23:12.Permalink | Comment | Email this