Milk Adulteration Test Guide — 10 Home Tests

Is your milk really pure? Use these 10 easy home tests — published by FSSAI in their DART booklet — to check for water, starch, detergent, urea, formalin and 7 other common adulterants.

What you need:

  • A smooth, slightly inclined polished surface (tile, glass)
  • A few drops of milk

Procedure:

  1. Place a drop of milk on the polished inclined surface.
  2. Watch the drop flow down the surface.
  3. Observe whether it leaves a white trail behind it.
✓ Pure milk: Pure milk flows slowly and leaves a thick white trail behind the drop as it moves.
✗ Adulterated: Watered milk flows quickly, immediately, and leaves no trail — or only a very faint one.
Note: This is the easiest test to do at home. It catches crude water adulteration but not sophisticated synthetic milk.

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About milk adulteration in India

A 2019 FSSAI survey of 6,432 samples across India found that roughly 37% of processed milk and 10% of raw milk samples did not meet the prescribed safety standards. The most common problems were higher-than-permissible bacterial counts and added water or starch. A smaller but more dangerous subset contained synthetic milk — a toxic mix of detergent, urea, vegetable oil and water.

Most adulteration is economic — milkmen add water to stretch supply, add starch to restore viscosity, and add neutralisers to mask souring. These are dishonest but not immediately toxic. The genuinely dangerous adulterants are urea, ammonium sulphate, formalin and detergent — used only in large-scale synthetic milk operations. These cause kidney damage, gastritis, cancer and are especially harmful to children and elderly consumers.

How to use these tests practically

Start with the water test (easiest, just a drop on a tile) and the detergent test (shake with water, look for foam). These two cover 80% of cases. If both are clean but you are still suspicious, move to starch and urea. The more chemical tests (formalin, ammonium sulphate) need real reagents and should be done with supervision.

For any legal action or bulk testing, always send samples to an FSSAI-accredited lab. The home tests here are for personal awareness — results won’t stand up in a food safety case.

How to report adulterated milk

  1. Call FSSAI’s national helpline: 1800-112-100 (toll-free).
  2. Email: complaints@fssai.gov.in with sample photos and your test results.
  3. Find your local Food Safety Officer (FSO) at fssai.gov.in and file a written complaint with a sealed sample.
  4. For urgent cases, many states have WhatsApp complaint numbers — search “food adulteration complaint [your state]” for the current one.

Source: This guide is built from FSSAI’s publicly available DART (Detect Adulteration with Rapid Test) booklet and Indian dairy safety literature. FSSAI publishes these procedures for free consumer awareness.

Milk Adulteration FAQs

Common questions about detecting and reporting adulterated milk in India.

How common is milk adulteration in India?

An FSSAI pan-India survey (published 2019) found that about 37% of processed milk and 10% of raw milk samples did not meet safety standards. Water is by far the most common adulterant, followed by detergent, glucose, starch, urea and vegetable oil in synthetic milk.

Are home adulteration tests reliable?

The simple tests (water, starch, detergent, soda) are quite reliable at the qualitative level. The more chemical tests (formalin, urea, ammonium sulphate) give a clear yes/no result but only if done correctly. For any legal action or bulk testing, always send samples to an FSSAI-accredited lab — results from there are admissible as evidence.

What are the health effects of drinking adulterated milk?

Depends on the adulterant. Water alone is not harmful but reduces nutrition. Starch, sugar and vegetable oil are cheating but not acutely toxic. Urea, ammonium sulphate and formalin cause kidney damage and are carcinogenic with prolonged exposure. Detergent causes diarrhoea and gastritis. Children and elderly are at highest risk.

How do I report adulterated milk?

File a complaint with your local Food Safety Officer (under FSSAI) with a sample of the suspected milk. You can also call the FSSAI helpline at 1800-112-100 or email complaints@fssai.gov.in. Many states also have direct WhatsApp numbers — search "food adulteration complaint [your state]" for the current number.

Which is the safest way to buy pure milk?

(1) Buy from a known dairy farmer who milks in front of you, (2) or from a trusted brand (Amul, Mother Dairy, Country Delight, etc.) that does regular third-party testing, (3) or from a DudhHisaab-powered local milkman who records FAT-SNF readings per entry. Always check for FSSAI number on the package or invoice.

Is this test guide endorsed by FSSAI?

No — this is a consumer education page built from FSSAI's publicly available "Detect Adulteration with Rapid Test" (DART) booklet. FSSAI publishes these procedures for free awareness. Always confirm details at fssai.gov.in or with a trained food analyst.