What is the recommended humidity range for storing open packages of photographic film?

The recommended humidity range for storing open packages of photographic film is 40 to 60 percent. This range is crucial because excessive humidity can lead to condensation on the film, which might cause fogging or other damage, while too low humidity can cause the film to dry out, potentially affecting its chemical properties and photographic quality. Maintaining humidity within this range helps ensure that the film remains stable, preserves image quality, and minimizes the risk of degradation over time. This is particularly important for photographic film, as it is sensitive to environmental conditions, which can directly impact its performance and longevity.