1.0 µg per capsule

Mercaptan, like drains or rotting garbage”

Certified water flavour standard used to train professional tasters to recognize and scale the intensity of earthy mercaptan. Methanethiol is formed by anaerobic sulphate-reducing bacteria and Cyanobacteria. It can also arise due to decomposition of plants and algae in lakes and reservoirs. Methanethiol imparts an unpleasant sulphury note, reminiscent of drains or rotting garbage.

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

Flavour cards

Flavour standard information

Technical specification

The best way to assess mercaptan flavours in water is as follows. Without covering the glass, swirl the sample to release the aroma. Take a single short sniff. Repeat as necessary.
Amount of flavour per capsule
1.0 µg per capsule
The flavour threshold of methanethiol in water is 330 ng / l.
Methanethiol is formed in water by anaerobic sulphate-reducing bacteria and Cyanobacteria or by decay of grass or algae in lakes or reservoirs. It can also arise from decomposition of algae following an episode of algal bloom.
Methanethiol imparts an unpleasant sulphury note to water. It is easily oxidized to less odour-active species, so its presence is indicative of the failure of water treatment processes or post-treatment contamination.
CAS registry number
The CAS registry number of methanethiol is 74-93-1.
Other names
  • methyl mercaptan
  • mercaptomethane
  • methane thiol
  • methyl sulfhydrate
  • thiomethanol
  • thiomethyl alcohol
Methanethiol is often found in association with other sulphur compounds such as H2S and dimethyl trisulphide. Be careful not to overexpose yourself to samples with methanethiol. The more you look for it the less likely you are to find it.
Threshold distribution
Capsules per pot
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