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milk contain a yellowish substance?why and because of what?
If milk is left to stand, a layer of cream forms on the surface. The cream differs considerably in appearance from the lower layer of skim milk.Fats are partly solid at room temperature. About 98% of milk fat is a mixture of triacyl glycerides.
Milk is made up of about 87% water and 13% solids, such as fat and various proteins.  Chief among these proteins is something called casein, four types of which make up about 80% of the proteins in milk.  The casein protein molecules are typically suspended somewhat uniformly throughout the milk and are spherical, about a micrometer across.  The reason they are typically somewhat uniformly suspended in the liquid is because kappa-casein molecules have a negative electrical charge, so they repel each other.


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