Do not store permanent records in barns, equipment sheds, or any other building without the capacity for heating and cooling as needed. High humidity is especially problematic in basements, where ground water and cooler temperatures encourage water vapor to collect. When mold occurs, reduce the temperature and relative humidity. Do not move records or try to remove mold from records without first consulting with preservation personnel. Determining the mold species is an important first step in addressing the mold outbreak.
Some molds can present very serious health concerns.
Lowering temperature and relative humidity levels and increasing air circulation are usually required to discourage future mold growth. Damage from light is irreversible, and the effects of exposure accumulate over time. A record exposed to a dim light for a long time will ultimately show the same effects as a record exposed to a bright light for a short time. Reduce exposure to the greatest degree possible. Cover windows with shades or drapes that block light entirely.