If you wait longer than that, there’s a chance the milk might go sour, even if it’s before the best-by date. Can you use milk after its expiration date? As we mentioned earlier, you can likely ...

Never use dirty utensils or hands when handling milk. This prevents the introduction of bacteria that can cause it to sour faster. Always check the expiration date before purchasing or using milk.

Messrs. Editors—It may not be generally understood by scientific men, bnt it is well known to dairy men and housewives that a violent thunderstorm turns sweet into sour milk. To ascertain ...