Hi Sarah,

This is from an article by Paul Messier of Conservators of Fine Arts and Material Culture
Rocky Mountain Conservation Center

 

The deterioration of cellulose acetate (diacetate and triacetate) films is characterized by the "vinegar syndrome." Very similar to the degradation of nitrates, acetates suffer from chemical decomposition resulting in the production of acids. Acetic acid, which is produced by deteriorating acetate negatives, is detectable by a characteristic vinegar odor. Also like nitrates, diacetates and triacetates become very brittle. The film base can develop bubbles and crystals. Diacetate and triacetate characteristically form deep, wavy grooves in the film base known as "channelling." This condition is the result of the film base shrinking in relation to the gelatin emulsion.

Like degraded nitrates, acetates that show signs of deterioration should be isolated and handled carefully to avoid health risks. Unlike nitrate film, however, deteriorated acetate film does not pose a serious fire hazard.

Deteriorated negatives, especially nitrates, can emit a noticeable and noxious odor. Such gasses can cause skin, eye, and respiratory irritations. Allergic sensitivity has also been noted, as has dizziness and lightheadedness. Handle deteriorated negatives in a well-ventilated area. Wear neoprene gloves, remove contact lenses, and limit exposure times. It is also advisable to wear goggles and a respirator with acid/organic vapor filter cartridges.

Here is a link for the Image Permanence Institute for a step by step plan on how to deal with this problem

Hope this helps

Wilma

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