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Why are my hops smelling Cheesy, Catty or Pyrazine?

This is usually caused by using old expired hops. At low levels of oxidation, one gets the catty notes (cat urine, tomato or grape leaves). However, at a higher level of degradation, one gets the cheesy notes. Making hop tea from the ingredients helps to identify them early. Storing hops in oxygen-free and inside a refrigerator helps counter this issue. In wine, larvae of some insects when crushed also yield similar urine like rancid bitter notes.

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