IPI Storage Guide for Acetate Film

Collection managers will find this tool from the Image Permanence Institute invaluable in evaluating the quality of the storage environment they provide for their film. Easy to use wheel has two sides, one for new film, the other for partially degrading film. To calculate the approximate time to the onset of vinegar syndrome of new film, just turn the wheel to the storage temperature and check the relative humidity. For film that is degrading, use the other side of the wheel to calculate the approximate time for free acidity to double. Also included are graphs, a "Time Out of Storage" table and instructions.