Blue ice (aviation)
Ice leaked from aircraft septic tanks / From Wikipedia, the free encyclopedia
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In aviation, blue ice is frozen sewage material that has leaked mid-flight from commercial aircraft lavatory waste systems. It is a mixture of human biowaste and liquid disinfectant that freezes at high altitude. The name comes from the blue color of the disinfectant. Airlines are not allowed to dump their waste tanks mid-flight, and pilots have no mechanism by which to do so;[1] however, leaks sometimes do occur from a plane's septic tank.