It had bad pitting on the other side.
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It had bad pitting on the other side.
Celluloid is nitrocellulose! Nitrocellulose (also: cellulose nitrate, flash paper) is a highly flammable compound formed by nitrating cellulose through exposure to nitric acid or another powerful nitrating agent. When used as a propellant or low-order explosive, it is also known as guncotton.
Over a period of time this nitrocelulose breaks down and minute amounts of nitric acid in a gasious form are extruded from the celluloid and eat at the metal. It only occurs in celluloid.
John