There are 5 names in this directory containing the search term oxidation. Clear results.
Coloring from the oxidation of a coin’s metal caused by a reaction with the cloth bag the coin was stored in.
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.
The formation of oxides or tarnish on the surface of a coin, token or medal from exposure to the environment. See also toning.
A numismatic item with a rough or granular surface resulting from oxidation. Commonly used to describe old copper coins.