Question

Give any three tests to check the adultoration of milk.

Answer 1

Answer:

1. The presence of water can be detected by putting a drop of milk on a polished slanting surface. The drop of pure milk flows slowly leaving a white trail behind it, whereas milk adulterated with water will flow immediately without leaving a mark.
2. Take 5-10 millilitres (ML) of milk sample and equal quantity of water
3. Shake the mixture thoroughly
4. If the milk is adulterated with detergent, it forms dense lather
5. Pure milk will have a thin layer of foam.
6. Boil 2-3 ML of the sample (milk, khoya, chenna or paneer) with 5 ML of water
7. For other ghee and butter, water need not be added
8. Add 2-3 drops of tincture of iodine after letting it cool
9. Formation of blue colour indicates the presence of starch.

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Answer 2

Answer:

Test for adulteration in milk can be done at home using following ways,

Reduction Test. Boil milk on slow heat for 2-3 hours till it solidifies and become hard (khoya). ...

Checking for Synthetic Milk. ...

Water in milk. ...

Vanaspati/Dalda in milk. ...

Starch in milk. ...

Formalin in milk. ...

Test for urea in milk.