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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.”


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


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


Compounding oxygen with another element.