From a recent study published in Proc. Nat. Acad. Sci. (USA):

http://m.phys.org/news/2013-09-odor-...-bad-wine.html

It is interesting that TCA actually mutes our sense of smell, which also
accounts for the phenomenon of "fruit scalping" when low levels of TCA
are present.

Mark Lipton
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alt.food.wine FAQ: http://winefaq.cwdjr.net