Milk and Milk Products
The acidity may be described as "aromatic" when

appreciable amounts of volatile fatty acids are produced by Coliform bacteria
Streptococcus lactis and other lactis are growing together
All of these
Lactic streptococci and aroma forming Leuconostoc species are growing together

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

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

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