Musk oil
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Musk oil is a fragrant essential oil derived originally from the musk deer and now mostly produced synthetically, used as a base note in perfumery for its warm, sensual scent. Frasier accidentally breaks a bottle of musk oil in the elevator, adding to the mounting romantic tension between him and Kate.
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Mentioned once in The Adventures of Bad Boy and Dirty Girl.
The Adventures of Bad Boy and Dirty Girl
Season 3 · Episode 7 · S03E07
“I seem to have broken a bottle of something... Musk oil!”