SOME FUNGOUS CONTAMINANTS OF OPTICAL INSTRUMENTS

Abstract

The following molds were isolated and cultured from the glass surfaces of optical instruments Aspergillus niger (obtained twice), Monilia sitophila. Penicillium frequentens, Pullularia pullulans. and one species each Alternaria, Bassisosporium. Cladosporium. and a pyrenomycete. Attempts to grow these molds on 6 of the commonly used types of optical glass without other nutrient matter failed. Unless the mold growth is removed from the glass surface, the moisture will damage the surface and leave it etched or raised where the mold growth occurred. Cleanliness, lowered humidity, and fungicides have been found useful protection from fouling of lenses by molds.