How to Check Purity of Milk at Home And Milk Products

How to Check Purity of Milk at Home

Milk is a common drink in our daily diet. For small kids to toddlers everyone needs milk daily life.But not every time the milk we take is pure; it may have urea, formalin, vanaspati, starch and water as impurity.Packed milk from reputed brands as well as milk purchased from milk vendors can be adulterated so its important to check for them before consuming.

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As per Food Safety and Standards Authority of India, a food article could be declared adulterated if:

• When a substance is added which depreciates or injuriously affects it.


• Cheaper or inferior substances are substituted wholly or in part.


• Any valuable or necessary constituent has been wholly or in part abstracted.


• It is an imitation.


• It is colored or otherwise treated, to improve its appearance or if it contains any added substance injurious to health.


• For whatever reason its quality is below the standard.

Some tests for adulteration in milk can be done at home:

Reduction Test:

Boil milk on slow heat for 2-3 hours till it solidifies and become hard (khoya). Rock solid, rough residue means the milk is adulterated while oily residue means its of good quality.

Checking for Synthetic Milk:

Synthetic milk is made by mixing chemicals and things like soap in natural milk. Synthetic milk can be easily identified by bad taste and odour.It feels soapy when rubbed and turns yellowish when heated.Give your sense organs a sniff check,If you can sense a soapy odour and if it feels soapy when rubbed with fingers, then the milk has been made by mixing chemicals.

By Taste:

Pure milk is naturally sweet. If the milk in  fridge the taste bitter or sour, then it is either stale or has possibilities of being adulterated with detergent and soda.

Water in milk:

Water in milk may not be bad for your health but definitely for your pocket. To check, put a drop of milk on your fist or any slanted surface and let it flow down. If the milk leaves a trail behind, it’s not pure else it's good.

Starch in Milk:

Add a few drops of tincture of Iodine or Iodine solution. Formation of blue colour indicates the presence of Starch.Or you can test by adding salt.

Vanaspati/Dalda in milk:

Vanaspati is not good for health if consumed in big quantity. To check if milk is adulterated with vanaspati, add 2 talespoon of hydrochloric acid and 1 tbsp of sugar to 1 tbsp of milk. If the mixture turns red, its impure.

Urban Platter Soy Milk Powder, 400g

Urea in Milk:

One of the most common form of adulteration in milk is mixing of urea since it doesn’t changes the taste and is little difficult to detect. To check for urea in milk, mix half tablespoon of milk and soyabean or arhar dal powder together and shake well. After 5 minutes, dip litmus paper for 30 seconds and if there is a color change from red to blue it means the milk has urea in it.Or The milk can easily be tested by Urease Strips which are easily available in the Medical store.The percentage of urea in milk can be estimated by the colour of the strip changed.

S. No.   Urea in Milk    Colour of the Strip

1               0-0.2                Yellow

2              0.2-0.7             Peach

3              0.7-1.20           Reddish Brown

4             1.20-1.70           Pink

5             1.7-14.00         Magenta

Formalin in milk:

Formalin is used for preservation purposes. Since its transparent in color and can preserve milk for long time, packaged manufacturers use it for adulteration purposes. To test for formalin existence in milk, take 10 ml of milk in test tube and put 2-3 drops of sulphuric acid into it. If a blue ring appears at the top, milk is adulterated.

Test for Other Milk products:

Starch in Khoya:

Boil a small quantity of Khoya sample with some water, cool and add a few drops of Iodine solution or salt. The Formation of blue colour indicates the presence of Starch.

Starch in Chhena or Paneer :

Boil a small quantity of sample with some water, cool and add a few drops of Iodine solution or salt. The formation of Blue colour indicates the presence of starch.

Buy milk purity test kit:

Test - O - Milk Strip Based Milk Testing Kit For Testing Chemically Adultrated Milk ( Dfrl ) - 94


Akashganga - "Rakshak" Milk Purity Meter

Osasbazaar Pure Silver Mickey Mouse Baby Milk and Coffee Mug - Purity Certified

Lakme Peach Milk Moisturizer Body Lotion 200 ml

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