How to Test Milk for Adulteration (Urea, Detergent, Starch)
⚡ Quick 60-Second Milk Purity & Adulteration Verdict
FSSAI & WHO Alert: Over 68% of non-compliant milk samples in commercial surveys contain water dilution, synthetic detergent (lathering agent), urea (SNF booster), or starch. Raw milk must pass 3 quick home checks before boiling.
Put 1 drop on a polished slanting surface. Pure milk flows slowly, leaving a distinct white trail behind. Watered milk flows instantly with zero white trace.
Shake 10ml milk + 10ml water vigorously in a bottle for 20s. Pure milk forms light foam that settles in seconds. Detergent forms thick, long-lasting soap lather.
Boil 5ml milk, cool, and add 2 drops of iodine tincture. Turns blue-black = adulterated with starch/flour. Stays pale yellow/white = pure.
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Inspection Guide
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Milk Purity and Adulteration Detection
Milk is frequently adulterated with water, urea, detergent, and starch to increase volume and thickness.
1. The Shake Test (Detergent Check):
Shake a small amount of milk in a glass bottle or container. Pure milk forms small bubbles that disappear quickly. Detergent-adulterated milk forms thick, dense foam that persists for a long time.
2. The Slip Test (Water Dilution):
Put a drop of milk on a polished slanted surface (like a steel plate). Pure milk flows slowly, leaving a distinct white trail behind. Water-diluted milk flows instantly without leaving any trail.
3. The Iodine Test (Starch Detection):
Add a drop of iodine to a small sample of milk. If the milk turns blue-black, it indicates the presence of starch or flour used as a thickener.
4. The Texture Test (Urea/Soap):
Rub a few drops of milk between your fingers. If it feels unusually slippery or soapy, it likely contains detergent or urea.
Quick Safety Tips
- Dense foam after shaking indicates detergent
- Pure milk leaves a white trail on slanted surfaces
- Iodine test for starch/flour detection
- Buy from trusted dairies and check for organic certification
Primary Chemical Concerns
Health Risks & Impacts
Multilingual Local Names
Common Storage Pests
Spoilage Bacteria
high riskMicroorganisms like Lactobacillus that cause milk to sour or curdle.
Detection
- Sour or "off" smell
- Separation of solids (curdling)
Prevention
- Keep refrigerated below 4°C
- Ensure the container is sanitized
Corrective Action: What to do?
Discard immediately if sour or curdled.
Regulatory Corner: FSSAI (Food Safety and Standards Authority of India) / US FDA
Regulation: Food Safety and Standards (Food Products Standards) Regulations 2011, Clause 2.1.1: Standards for Milk & FDA 21 CFR 131.110
Legal Limit:Milk Fat: Min 3.5% (Cow) / 6.0% (Buffalo); Solids-Not-Fat (SNF): Min 8.5% (Cow) / 9.0% (Buffalo); Added Water: 0.0%; Urea, Detergent, Neutralizers, Starch: 0.0% (Strictly Prohibited); Aflatoxin M1: Max 0.5 µg/kg
Report Adulteration to FSSAI (Food Safety and Standards Authority of India) / US FDA