This is the result of mold or mildew, caused by high humidity and high temperature. It may not require immediate treatment, unless a deposit is left on the material, in which case the fungus may still be active. In the latter case, limit access and refer to a conservator immediately. Mold and mildew May appear in a variety of fungal forms, including powder, fibers, and feathery growth. These are serious problems that demand immediate attention.
Fungi occur because library materials consist of organic matter.
The fungus will begin to digest the host material, leading to serious damage. Their presence is caused by the combination of high humidity and high temperature. Environmental conditions must be improved and maintained to alleviate this problem and prevent its recurrence. Affected materials must be temporarily removed from the collection areas, as spores are airborne and easily spread, especially in enclosed cases. This problem must be referred to a trained conservator.