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This 3M Petrifilm Yeast and Mold Count Plate is a sample-ready-culture medium system which contains nutrients supplmented with antibiotics, a cold-water-soluble gelling agent, and an indicator that facilitates yeast and mold enumeration.
Yeasts are easily differentiated from molds on the plate:
Yeasts are typically indicated by small, blue-green colonies with defined edges and no foci.
Molds are indicated by large, variably-colored colonies with diffuse edges and center foci.