Purity
How to Check Ghee Purity at Home | Lab Test Parameters & FSSAI Tests
Home tests suggested by FSSAI to check ghee purity | Simple tests, limitations, and key laboratory parameters (RM value, Baudouin) that prove authenticity.
By Farm Dip dairy team7 min read
Key takeaways
- Home tests can catch obvious adulteration, but skilled adulteration passes them.
- Vanaspati, vegetable oils, animal body fat and starch are the common adulterants.
- Lab tests such as RM value, BR reading and phytosterol acetate are the reliable checks.
- Buy from brands that publish a report for every batch, not one old certificate.
What is ghee adulterated with?
Ghee is expensive, which makes it a common target for adulteration in India. The usual adulterants are vanaspati (hydrogenated vegetable fat), refined vegetable oils, animal body fat, and starches such as mashed potato or flour added for body.
Simple home tests
- Heat test: warm a teaspoon of ghee in a pan. Pure ghee melts at once and turns dark brown. Ghee that melts slowly or stays yellow may be adulterated.
- Palm test: rub a little ghee on your palm. Pure ghee melts from body heat within a minute.
- Starch test: add a few drops of iodine tincture to melted ghee. A blue colour means starch has been added.
- Vanaspati test (from FSSAI's DART guide): mix one teaspoon of melted ghee with an equal amount of concentrated hydrochloric acid and a pinch of sugar. A crimson colour suggests added vanaspati. Handle the acid with care.
- Fridge test: melt ghee in a jar and refrigerate. Separate layers can indicate other fats were mixed in.
These tests catch crude adulteration. A careful adulterant blend can pass all of them, which is why lab testing matters.
What a lab test checks
Indian labs test ghee against FSSAI standards. These are the parameters that matter most:
| Parameter | What it detects | FSSAI limit (typical) |
|---|---|---|
| Butyro-refractometer (BR) reading at 40°C | Foreign oils and fats | 40.0 to 43.0 |
| Reichert-Meissl (RM) value | Dilution with non-milk fats | Minimum 24 (varies by region) |
| Polenske value | Coconut and other lauric oils | 1.0 to 2.0 |
| Baudouin test | Vanaspati (contains sesame oil by law) | Negative |
| Phytosterol acetate test | Any vegetable fat | Negative |
| Moisture | Water, which shortens shelf life | Maximum 0.5% |
| Free fatty acids | Staleness or rancidity | Maximum 3.0% |
What to ask a ghee brand
- Is there a lab report for the batch I am buying, or only one sample from years ago?
- Is the lab NABL-accredited and independent?
- Does the report include the phytosterol acetate and Baudouin tests?
- Can I match the batch number on my jar to the report?
Frequently asked questions
How can I check if ghee is pure at home?
Heat a spoon of ghee: pure ghee melts quickly and turns dark brown. Add iodine to melted ghee to check for starch (blue means starch). For vanaspati, FSSAI's DART guide uses hydrochloric acid and sugar: a crimson colour indicates adulteration.
Does pure ghee solidify in the fridge?
Yes. Pure ghee becomes solid and evenly textured in the fridge. Distinct separate layers can suggest other fats have been mixed in.
Which lab test proves ghee has no vegetable fat?
The phytosterol acetate test. Plant sterols are only present in vegetable fats, so a negative result shows no vegetable fat was added.
