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Appearance of yeast and mold on 3M Petrifilm RYM Plates
| Yeast | Mold |
|---|---|
| Small colonies | Large colonies |
| Colonies have defined edges | Colonies have diffused edges |
| Pink/tan or blue/green in color | Blue/green to variable upon prolonged incubation |
| Colonies appear raised (three-dimensional) | Colonies appear flat |
| Colonies have a uniform color | Colonies have a dark center with diffused edges |
