Sour milk

Definition and stakes

T. D. Curtis,  Hints on Dairying

“ Sour or tainted milk, to any perceptible degree, ought not to be received at the factory. One such mess will injure, if it does not spoil, a whole batch. The sour milk is likely to lead to a sour, leaky batch, and the tainted milk to huffy if not floating curd, and porous, quickly off-flavor and decaying cheese. We have little patience with those who deliver such milk, and none with those who attempt to devise [65] means to work it into palatable cheese and thus to get it into the unsuspecting stomachs of the consumers. It is too much like making omelets of rotten eggs. ”
Source: Gutenberg

Ontario. Department of Education,  Ontario Teachers' Manuals: Household Science in Rural Schools

“ The greatest care should be exercised in protecting milk from dust and dirt, for it is easily contaminated and may be the means of carrying disease germs to the body. The changes which milk undergoes when souring do not render it harmful. For many people buttermilk is more easy of digestion than sweet milk, because of the changes produced by souring, as well as the absence of fat. Sour milk is of value in cooking, producing a tender bread which can readily be made light by the addition of soda—one teaspoonful of soda to one pint of sour milk that has curdled. ”
Source: Gutenberg

Sir Charles Alexander Cameron,  The Stock-Feeder's Manual

“ It is a matter of great importance that the dairy should not be situated near a pig-stye, sewer, or water-closet, the effluvia from which would be likely to taint the milk. It is surprising how small a quantity of putrescent matter is sufficient to taint a whole churn of milk; and as it has been demonstrated that the almost inappreciable emanations from a cesspool are capable of conferring a bad flavor on milk, it is in the highest degree important to remove from the churn and milk-pail every trace of the sour milk. ”
Source: Gutenberg

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