Milk of the cow is an opaque, white or yellowish white, very slightly alkaline fluid that is chemically termed as an emulsion which is a colloidal suspension of fat and other particles. It is just a little more viscous than water. In taste it is sweet or bland and it also has a faint but an unique odour. If kept for long it ferments and gets sour. Specific gravity of the ordinary milk is between 1.027 to 1.034. This is lower in a milk that has a higher fat content. If a drop of milk is inspected under microscope, numerous minute globules of fat can be seen to be floating as an emulsion.
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