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The 3M Petrifilm Coliform Count Plate is a ready-made culture medium system which contains modified Violet Red Bile (VRB) nutrients, a cold-water-soluble gelling agent, and a tetrazolium indicator that facilitates colony enumeration.
Petrifilm Coliform Count Plates are used to enumerate coliforms in 24 hours. The indicator dye in the plate colors all colonies red, and a top film