date:Sep 07, 2012
is dipped in it, and removed about 30 seconds later. If the litmus paper turns blue, urea is present in the milk.
Vanaspati
About 3ml of milk is taken in a test tube and about ten drops of hydrochloric acid are added to it. A teaspoonful of sugar is added to the mixture. After about five minutes, the mixture is examined. The red colouration indicates the presence of vanaspati in the milk.
Formalin
Formalin enhances the life of milk and is thus added for the purpose of preservation. About 10