Vinegar syndrome
Type of deterioration of film stock / From Wikipedia, the free encyclopedia
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Vinegar syndrome, also known as acetic acid syndrome,[1] is a condition created by the deacetylation of cellulose acetates (usually cellulose diacetate) and cellulose triacetate.[2] This deacetylation produces acetic acid, giving off a vinegar odor that gives the condition its name; as well, objects undergoing vinegar syndrome often shrink, become brittle, and form crystals on their surface due to the migration of plasticizers.[3] Vinegar syndrome widely affects cellulose acetate film as used in photography.[4] It has also been observed to affect older magnetic tape, where cellulose acetate is used as a base, as well as polarizers used in liquid-crystal display units and everyday plastics such as containers and tableware.[5][6][7][8] High temperatures and fluctuations in relative humidity have been observed to accelerate the process.[3] The process is autocatalytic, and the damage done by vinegar syndrome is irreversible.[3][4]