Thank you so much for the explanation! Once read, it does seem very logical, but being new to the world of perfumes (at least on this deep a level) I wasn't aware of this yet. Being new, I won't be able to challange or add to this subject. However, I do have a question, and the answer might add something to the subject. Why do some perfumes have both an EDP and an EDT version, whereas of some perfumes only one or the other seems to be sold. For example, Dior's Hypnotic Poison (only EDT) vs. Hypnotic Poison Elixir (only EDP) vs. Poison original (both EDT and EDP).