Mold caused by the growth of fungi can cause serious distortion and physical breakdown in most audio formats, groove oriented and magnetic formats alike. The development of mold on an audio medium is caused by fungal action conceived from improper storage temperature, RH and present moisture. The other major agent involved in fungal action is the presence of organic material due to unclean storage areas. Mold can be cleaned to some degree using fungicide. The fungicide must be non-toxic to humans and harmless to the physical make-up of the various recording media.