If you have read anything about ghee adulteration in India, you have seen the Baudouin test mentioned. It is the test the FSSAI specifies, and a negative Baudouin result is one of the legal requirements for a product to be sold as ghee.
What almost nobody explains is that the Baudouin test does not detect vanaspati. It detects sesame oil.
Why that is not a flaw
Vanaspati is hydrogenated vegetable oil. Visually and texturally it is a close match for ghee, which makes it the classic adulterant, and chemically it is difficult to distinguish from milk fat with a simple colour test.
So Indian regulation solved the problem from the other end. Manufacturers of vanaspati are legally required to add sesame oil to it. The sesame oil serves no culinary purpose. It is there purely as a marker, so that a cheap chemical test can reveal vanaspati wherever it turns up.
The Baudouin test detects sesame oil. Sesame oil in ghee means vanaspati in ghee. It is an elegant piece of regulation and it is why the test has survived for decades.
How the test works
The reaction relies on sesamol, a compound present in sesame oil. In the presence of concentrated hydrochloric acid and furfural, sesamol produces a distinct crimson or pink colour.
In laboratory conditions the method is broadly as follows:
- Melt and filter the ghee sample.
- Combine a measured quantity with concentrated hydrochloric acid and a furfural solution.
- Shake thoroughly and allow the layers to separate.
- Read the acid layer. A crimson or pink colour is a positive result. No colour change is a negative result.
A negative Baudouin is what a ghee sample needs in order to be legally sold as ghee in India.
Do not do this at home
Popular versions of this test circulate online, usually substituting sugar for furfural. They can work. We still would not recommend it, for one reason: concentrated hydrochloric acid.
It causes severe chemical burns on contact, its fumes damage your airways, and it reacts violently with a number of common household substances. It is not something to keep next to the cooking oil, and a colour change in a kitchen bowl is not evidence you could act on anyway.
If you genuinely want a sample tested, food testing laboratories across India will do it, and many are NABL accredited. It typically costs a few hundred rupees.
What a negative result does and does not tell you
A negative Baudouin means no detectable sesame oil, which in the Indian regulatory context means no vanaspati. That is meaningful.
It says nothing about:
- Adulteration with other vegetable oils that carry no marker
- Starch or other bulking agents
- Whether the milk was A2 or A1
- Whether the ghee was churned from curd or separated from cream
- Moisture content or free fatty acid levels
It is one line on a test report, not the whole report. A brand that quotes a negative Baudouin and nothing else is showing you the easiest number to pass.
Our ghee carries FSSAI licence 11525079000402 and every batch is tested before sale. Ask us on WhatsApp for the results on your batch code. See the ghee.