Sour milk vs. buttermilk?!
Answers: What is the difference?
Sour milk is often the result of milk fermenting on its own. Such milk may contain harmful bacteria and is best not consumed. Buttermilk as we purchase it in the supermarket today is a manufactured product, where milk, often skim is cultured and fermented.
Buttermilk originally was what remained after butter was churned out. It was essentially skim milk and not necessarily sour.
Milk can be made sour by the addition of an acid, usually lemon juice or vinegar, to substitute for commercial buttermilk in baking.
not sure but if i am making scones i always use sour milk it makes a difference and the scones turn out very good.
Buttermilk is the slightly sour liquid that is left over after butter is churned. It is thicker than regular milk and has a kind of yougurt taste. It is best when it is very cold. You can make sour milk to take the place of buttermilk in some recipes, by adding 1 TBSP of cider vinegar to 1 cup of milk and letting it sit for 10-15 minutes at room temperature for the flavors to develop.