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This paper reports data on CTA base film stability obtained at 21°C and −16°C. Results demonstrated the potential of subfreezing storage temperatures for stabilizing CTA films that have already started to decay. After six and a half years of storage at −16°C, no change in free acidity was observed for film pre-degraded to the onset of vinegar syndrome. Data obtained by natural aging at 21°C, 50% RH indicated that film acidity at least doubled within five years. These results were consistent with earlier predictions and reaffirmed the inappropriateness of film storage near normal room conditions. Data on the effect of changing temperature/RH on CTA base stability are reported. Results did not reveal that changing conditions caused extra CTA base decay. The data reinforced the potential value of the TWPI model in informing storage decisions.
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