Plastic enclosures include uncoated polyester film, uncoated cellulose triacetate, polyethylene, and polypropylene. Plastic enclosures are transparent. Photographs can be viewed without removal from the enclosure, thus it can reduce handling. However, plastic enclosures can trap moisture and cause ferrotyping (sticking, with a resultant glossy area). Plastic is not suitable for prints with surface damage, glass or metal-based photographs, nor for film-based negatives and transparencies from the 1950s, unless the latter are in cold storage. It should not to be used to store older safety film negatives as this may hasten their deterioration.