Denaturant
Definition
A chemical added to industrial ethanol to make it unfit for human consumption (and therefore exempt from beverage-alcohol excise). Indian Standards list pyridine, methyl isobutyl ketone (MIBK), tertiary butyl alcohol, diethyl phthalate and denatonium benzoate among approved markers.
- Purpose
- Render industrial ethanol unfit to drink
- Example markers
- Pyridine, MIBK, tert-butyl alcohol, diethyl phthalate
- Regulatory context
- Indian Standards approved denaturant list
Common questions
Why does regulation require ethanol to be denatured for industrial use?+
Denaturing exempts the ethanol from beverage-alcohol excise duty and licensing while making it unpalatable or harmful to drink, which lets industry use cheap ethanol without creating an incentive to divert it into illicit liquor.
How does a forensic lab confirm a seized liquid was denatured ethanol rather than legitimate spirit?+
By testing for the specific approved denaturant markers, such as pyridine or denatonium benzoate, in the sample, since their presence distinguishes diverted industrial alcohol from beverage-grade spirit.
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