60 µg per capsule

Indole, like pigs on a farm”

Certified water flavour standard used to train professional tasters to recognize and scale the intensity of indole character. Indole contributes an unpleasant farmyard note to water which is often associated with faecal contamination. It is formed by bacteria growing in water and also imparted, pre-formed, via ground water pollution.

Food grade | free from sensory impurities | extensively tested | safe to smell and taste.

Flavour cards

Flavour standard information

Technical specification

The best way to for tasters to detect indole in water is as follows. Cover the sample with your hand and swirl the glass to release the aroma. Remove your hand and take a single long sniff. Repeat as necessary.
Amount of flavour per capsule
60 µg per capsule
The flavour threshold of indole in water is 20 µg / l.
Indole is formed by bacteria growing in water, or contributed, pre-formed, by ground water pollution.
In addition to contributing an unpleasant farmyard note, the presence of indole can also indicate contamination of the water supply chain with faecal bacteria.
CAS registry number
The CAS registry number for indole is 120-72-9.
Other names
  • 2,3-benzopyrrole
  • ketole
  • 1-benzazole
DMS and skatole may often be found in water which contains indole. Big differences in perception of individual tasters result in about half regarding this flavour as a serious fault and half being oblivious to it.
Threshold distribution
Capsules per pot
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