Numismatic Dictionary

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There are 5 names in this directory containing the search term oxidation. Clear results.
bag toning
Coloring from the oxidation of a coin’s metal caused by a reaction with the cloth bag the coin was stored in.

brown
A term used to describe the color of a copper or copper-plated coin that has less than 5-percent of its original color because of natural oxidation.

oxidation
The formation of oxides or tarnish on the surface of a coin, token or medal from exposure to the environment. See also toning.

porous
A numismatic item with a rough or granular surface resulting from oxidation. Commonly used to describe old copper coins.

red brown
A term used to describe the color of a copper or copper-plated coin that maintains between 5-percent and 95-percent of its original color because of natural oxidation.

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