Milk skin

Milk skin
This article is about the skin that forms on top of milk. For the ingredient, see Scalded milk.

Milk skin refers to a sticky film of protein that forms on top of milk and milk-containing liquids (such as hot chocolate and some soups). It is caused by the denaturation of proteins such as casein.

When milk is boiled, soluble milk proteins are denatured and then aggregate and form a sticky film across the top of the liquid, which then dries by evaporation.

In Japan, a dairy product called So was made from layers of milk skin during the 7th-10th centuries. So was further processed to make Daigo.


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