date:Sep 07, 2012
ml of milk in a test tube and about 5ml of concentrated sulphuric acid is added from the sides of the wall without shaking it. If a violet or blue ring appears at the intersection of two layers then it shows the presence of formalin.
Detergent
About 5-10ml of the milk sample is mixed with an equal amount of water lather. When shaken, it indicates the presence of detergent.
Synthetic milk
Synthetic milk has a bitter after-taste, gives a soapy feeling when rubbed between the fingers and turns ye