Quick Facts
- FSSAI National Milk Quality Survey 2011: 68.4% of milk samples tested did not conform to FSSAI standards — this figure has improved significantly since packaged milk became dominant
- Water is the most common milk adulterant — it increases volume without obvious visible change. Hydrometer test detects water addition in seconds
- Urea is added to maintain the nitrogen content (which affects SNF — solids not fat readings) after water dilution. Urea at high levels causes kidney damage
- Detergent is added to create foam (mimicking the appearance of fresh milk) and emulsify added water with fat. Urease test strips can detect detergent at home
- Synthetic milk — a mixture of water, urea, vegetable oil, and detergent with no actual milk — has been found in some loose milk markets. It has no nutritional value
- Packaged, pasteurised milk from FSSAI-licensed dairies is significantly safer than loose milk — the risk is highest in loose milk sold by individual vendors
Types of Milk Adulteration
Water addition: The simplest and most common. Increases volume, reduces all nutrient concentrations proportionally. Reduces fat percentage, protein, and calcium content. The hydrometer (lactometer) detects water addition reliably.
Urea addition: Urea (a fertiliser component) is added to maintain the apparent protein/SNF content after water dilution. Urea contains nitrogen — and standard milk tests measure total nitrogen as a proxy for protein (Kjeldahl method). Urea inflates this reading. High urea consumption causes kidney stress.
Detergent addition: Creates foam, emulsifies water with fat (keeping the mixture visually consistent), and can increase the apparent viscosity. Detergent residues are toxic — causing gastrointestinal irritation and potentially more serious effects with chronic exposure.
Hydrogen peroxide: Added as a preservative to extend shelf life without refrigeration. Legal preservatives are allowed at specified levels; illegal levels or unapproved preservatives are added to loose milk meant for transport without cold chain.
Starch: Added to increase apparent density/viscosity after water dilution. Iodine test detects starch.
Synthetic milk: Rare but documented. Made from water, refined oil, urea, detergent, and caustic soda — no actual milk content. Detected by smell (artificial), bitter aftertaste, and chemical testing.
Home Tests for Milk Purity
Home Test: Lactometer Test (Water Detection)
Steps
- 1 Purchase a lactometer (available for ₹30–80 at pharmacy or online)
- 2 Fill a tall cylindrical container with the milk sample
- 3 Float the lactometer in the milk
- 4 Read the level where the milk surface meets the lactometer scale
Pure / Pass
Pure full-fat cow milk reads 1.028–1.034 on the lactometer scale. Buffalo milk reads slightly higher (1.030–1.036).
Adulterated / Fail
Adulterated milk with added water reads below 1.026. The more water added, the lower the reading. A reading of 1.020 or below indicates significant water addition.
Home Test: Reducing Sugar Test (Starch Detection)
Steps
- 1 Boil a small amount of milk and let it cool
- 2 Add 2–3 drops of iodine solution to cooled milk
- 3 Observe colour change
Pure / Pass
Pure milk turns orange-yellow with iodine — indicating no starch present.
Adulterated / Fail
Milk adulterated with starch turns blue-black with iodine — the characteristic starch-iodine reaction indicates added starch.
Home Test: Detergent Test
Steps
- 1 Take 5–10ml of milk in a test tube or small container
- 2 Shake vigorously for 5–10 seconds
- 3 Observe the foam produced
Pure / Pass
Pure milk produces a small amount of foam that disappears quickly (within 30–60 seconds) after shaking.
Adulterated / Fail
Milk containing detergent produces a thick, stable foam that persists for several minutes — the detergent creates persistent foam bubbles.
Home Test: Urea Detection Test
Steps
- 1 Mix 5ml of milk with 0.2ml of urease solution (available from chemical shops)
- 2 Add 0.1ml of Bromothymol Blue indicator
- 3 Wait 10 minutes and observe colour
Pure / Pass
Pure milk shows no colour change — the indicator stays yellow-green.
Adulterated / Fail
Milk with urea turns blue — urease breaks down urea to ammonia, which changes the pH detected by the indicator.
FSSAI Data — Improvements Since 2011
The 2011 survey’s 68% non-compliance figure alarmed the nation and catalysed enforcement action. Subsequent improvements:
- 2016–17 National Milk Safety and Quality Survey: Non-compliance dropped to 12% for packaged milk
- FSSAI intensified packaged milk testing and mandated cold chain requirements
- Loose milk remains higher risk — urban doorstep milk vendors face less systematic oversight
Current risk profile:
- Packaged, pasteurised milk from major dairies: Low risk
- Packaged milk from local/regional dairies: Low-moderate risk
- Loose milk from unknown vendors: Higher risk (particularly in smaller cities and rural areas)
Milk Adulteration Types — Risk and Detection
| Adulterant | Effect | Health Risk | Detection |
|---|---|---|---|
| Water | Increases volume | Low — reduces nutrition, not toxic | Lactometer test (instant) |
| Urea | Inflates protein reading | Moderate — kidney stress at high levels | Urease + BTB indicator test |
| Detergent | Emulsifies, creates foam | High — gastrointestinal toxicity | Shake test (foam persistence) |
| Starch | Increases density after water | Low — digestive only | Iodine test (blue-black) |
| Formalin | Preservation without cold chain | HIGH — carcinogen, toxic | Lab test required |
| Synthetic milk | Complete replacement | HIGH — no nutrition + toxicity | Chemical smell, bitter taste |
Water addition is most common; detergent and urea are more harmful. Packaged milk from licensed dairies dramatically reduces all these risks.
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Q Is boiling milk enough to remove adulterants?
Is boiling milk enough to remove adulterants?
No — boiling kills pathogens (bacteria) but does not remove chemical adulterants. Urea, detergent, synthetic compounds, and starch remain in milk after boiling. Boiling does remove some volatile adulterants but is not a purification process for chemical contaminants. The safest protection against milk adulteration is buying from verified, certified sources with tested products — not attempting to purify adulterated milk after purchase.
Q Is UHT (long life) packaged milk safer than fresh pasteurised milk?
Is UHT (long life) packaged milk safer than fresh pasteurised milk?
UHT milk is safer from a microbiological standpoint (sterile, requires no refrigeration unopened) but is not inherently safer from an adulteration standpoint. Both UHT and pasteurised milk from FSSAI-licensed, regularly tested dairies have similar adulteration risk profiles — low. The key variable is the brand and their testing practices, not the processing method. UHT milk does have lower heat-sensitive nutrient content (vitamin C, some B vitamins) due to the high-temperature processing — fresh pasteurised milk is nutritionally superior when from a verified source.
Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified healthcare provider before making dietary changes, especially if you have a medical condition.