ferrous sulphate

8.2 mg per capsule

Metallic, like ink or blood”

Certified beer flavour standard used to train professional beer tasters to recognize and scale the intensity of metallic character. Metallic flavours are often taints derived from contamination of beer with metal ions. They can sometimes arise as off-flavours due to lipid oxidation during beer ageing.

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

Flavour cards

Flavour standard information

Technical specification

The best way to detect metallic flavour notes in beer is as follows. Take a little beer into your mouth. Move it around with your tongue for a few seconds then swallow it. To confirm, rub a little of the beer onto the back of your hand and check for metallic odour.
Amount of flavour per capsule
8.2 mg per capsule
The flavour threshold of ferrous sulphate in beer is 2.7 mg / l.
Metallic taints are erived from contamination of beer with metal ions, either from brewing raw materials or from corrosion of brewery plant. Metallic odours can also be produced by lipid oxidation.

Metallic taints are confused by professional tasters with the following flavour notes

  • Sulphitic
  • Citric acid
  • trans-2-Nonenal
Taint and occasionally off-flavour in beer. Primarily affects beer mouthfeel but occasionally beer odour can also be affected.
CAS registry number
The CAS registry number of ferrous sulphate is 7782-63-0.
Other names
  • ferrous sulfate
  • iron(2+) sulfate
  • iron(2+) sulphate
  • ferrous sulphate heptahydrate
  • ferrous sulfate heptahydrate
  • iron(2+) sulfate heptahydrate
  • iron(II) sulfate heptahydrate
  • iron(II) sulphate heptahydrate
Copper, manganese and tin can also generate metallic notes in beer. Such metals stabilize beer foam, giving rise to an improved foam appearance. They also shorten beer flavour life by catalysing oxidation of beer..
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
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capsule for metallic beer flavour standard
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