Contaminants, especially sulphur, can be transferred onto to negatives from your fingers. Extra care should be used to handle film by its edges, and white cotton or nylon gloves should ideally be worn. The more the negatives are used, the greater the risk of damage. To prevent the emulsion from being scratched, be very cautious when removing film from or placing film in, any kind of protective sleeve. Avoid sliding film in or out of its sleeve as much as possible.
Films can also have other interactions with different generic film types.
Diazo and silver gelatin should never be stored together. Nitrate materials must also be isolated from other film types. To avoid problems, file different types of film in separate sleeves and boxes. Avoiding Pollutants Dust and dirt particles in the air, may create scratches or other reactions with film. The use of storage materials made with wood, press board, or particle board should be avoided.