Air humidity content inside of the film archive can be affected by many factors: Length of the storage time, type of the films, type of image and their value.
An excess of humidity could damage the film and their base in both black and white or color images. The film manufacturing process is also very demanding in air humidity conditions.
If this excess humidity is not treated, this can cause corrosion on metals and microbial damage on organic materials.
Depending on the record type, best conditions are varying between 15% and 50% Relative Humidity degree for preventing the important materials as much as you can.
It should be considered that the temperature is also very important in record storage and manufacturing.