acetic acid

275 mg per capsule

"acetic, like vinegar or spoiled beer"


Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of acetic character. Acetic acid is an off-flavour formed in beer as a result of yeast metabolism or the activities of wild yeasts or acetic acid bacteria.

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

Flavour cards

Flavour standard information

Technical specification

The best way to evaluate acetic flavour in beer is as follows. Without covering the glass, swirl the beer to release the aroma. Take a single short sniff. Repeat as necessary.
Amount of flavour per capsule
275 mg per capsule
The flavour threshold of acetic acid in beer is approximately 90 mg / l. The precise figure depends on the pH value of the beer.
Acetic acid is produced by yeast during fermentation. Too much yeast growth, contaminating bacteria and wild yeasts can all result in production of excessive levels of acetic acid.

Professional beer tasters sometimes confuse acetic flavour with the following:

  • Citric acid
  • Lactic acid
  • Acetaldehyde
Acetic acid is present in all beers. It is the characteristic flavour of some beer styles, eg Lambic beer. It is present in all lagers, ales, stouts and wheat beers as a normal component of a balanced flavour. It becomes and off-flavour when present at high concentrations. Acetic flavour is a common problem in draught-dispensed beers, where it results from growth of contaminating acetic acid bacteria or wild yeasts.
CAS registry number
The CAS registry number of acetic acid is 64-19-7.
Other names
  • ethanoic acid
  • ethylic acid
  • methanecarboxylic acid
  • vinegar acid
  • acetasol
  • acide acetique
  • shotgun
  • vinegar
The intensity of acetic flavour increases with decreasing beer pH value.
Threshold distribution
Capsules per pot
Legal notices
This product is protected by the following trade marks and patents:
  • US Patent no. D679900
  • European Community Trade Mark
    Registration no. 009937574
  • European Community Trade Mark
    Registration no. 009856527
  • US Trade Mark Registration no. 4345057
  • US Trade Mark Registration no. 4345056
Free Shipping
beer flavour standard - acetic acid
earn 7 points

You may also be interested in