The term refers to milk that has not been homogenized, resulting in a visible layer of cream separating and rising to the top of the container. This distinct characteristic arises from the natural fat globules in the milk, which, without homogenization to break them down, coalesce and form a noticeable band of cream. Observing this separation is a key indicator of this type of minimally processed dairy product.
This type of milk is often valued for its perceived natural qualities and flavor. Proponents suggest it offers a taste closer to that of milk produced before widespread industrial processing. Historically, all milk exhibited this characteristic before the advent of homogenization techniques. The retention of natural fat structure may also appeal to consumers seeking less processed foods with potentially different nutritional profiles.