
Originally Posted by
REB80
Hi-I believe what you are describing is callled the “trigrminal” scent. Very powerful aroma chemicals - typically ones which add “lift” in heavy dilution cause the sensation of smelling something like ammonia, but oddly you can detect the more pleasant aspects from across the room - precisely what lends “lift” or extends the “silage” of a fragrance. Examples of other aroma chemicals with this “trigeminal” scent are ambrocenide, which smells like amber/wood from across a room, but poisonous like ammonia up close and allyl amyl glycolate and dynascone which smell like galbanum with a pineapple facet from afar, but again, ammonia up close. Materials such as these can be diluted to 10% or even 1% and added in traces to a fragrance concentrate.
Trigeminal refers to the trigeminal nerve which is responsible not for taste and smell, but contributes nerves which detect the coldness you get from mint or eucalyptus as well as that choking sensation from poisons to protect us as humans from noxious poisons. It took a brave soul to first use a chemical with this quality in a fragrance-now so common.