TEST FOR FORMALIN IN MILK

TEST FOR FORMALIN IN MILK

AIM:
To detect formalin (formaldehyde) in milk.

APPARATUS:
Test tube, ice bath.

REAGENT:
Sulfuric acid, ferric chloride.

PRINCIPLE:
Formalin reacts with ferric chloride and acid to give a violet ring.

PROCEDURE:

• Take 5ml milk in a test tube.

• Add 5ml sulfuric acid with FeCl₃ carefully along the wall.

• Observe for a violet ring at the interface.

RESULT:
Presence of violet ring indicates formalin.