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Orange Peel:

A surface roughening defect resulting from using metal that has a coarse grain size. Also referred to as “pebbles” and “alligator skin.”

Overaging:

Aging under conditions of time and temperature greater than those required to obtain maximum strength.

Oxidation:

The addition of oxygen to a compound. Exposure to atmosphere sometimes results in oxidation of the exposed surface, hence a staining or discoloration.

Oxide:

Compounding oxygen with another element.