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Table 2014.05D. 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 to blue/green in color
Blue/green to variable upon prolonged
incubation
Colonies appear raised (3-dimensional)
Colonies appear flat
Colonies have a uniform color
Colonies have a dark center with diffused
edges
Candidates for 2016 Method of the Year
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