what is "freezer taste"?

[eub]

There's a characteristic taste that everything stored in a freezer takes on, no matter what the food is itself. What is that taste?

• cryophilic microbiological flora
  
• plasticizer in freezer door gasket material
  
• actually not a foreign addition, but characteristic of freeze-drying
  

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[eub.livejournal.com]