Food Spoilage Tests For Dairy Products

Milk is spoiled when it starts to look like yogurt.

Yogurt is spoiled when it starts to look like cottage cheese.

Cottage cheese is spoiled when it starts to look like regular cheese.

Regular cheese is nothing but spoiled milk anyway and can't get any more spoiled than it is already.

Cheddar cheese is spoiled when you think it is blue cheese but you realize you've never purchased that kind.