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Lightstruck or skunky flavour in beer develops when

  • A.Carbon dioxide escapes slowly through the closure
  • B.Light acts on hop compounds in the presence of riboflavin
  • C.The beer is stored at too low a temperature for too long
  • D.Wild yeasts ferment the last of the residual sugar

Answer: B

Light, particularly in the blue range, drives a reaction between riboflavin and the iso-alpha acids from hops that yields a thiol smelling strongly of skunk. Brown glass filters most of the offending wavelengths, which is why clear and green bottles are more vulnerable.

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