Milk and Milk Products
Pseudomonas syncyanea produces a

bluish gray to brownish color in milk in its pure form
yellow color in milk
gray to brownish color in milk
brownish color to bluish gray in milk in its pure form

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Milk and Milk Products
Non bacterial ropiness or sliminess in milk and milk products may be due to the

All of these
stringiness due to thin films of casein or lactalbumin during cooling
stringiness caused by mastitis and in particular by fibrin and leucocytes from the cow's blood.
sliminess resulting from the thickness of the cream

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