Originally Posted by scentemental That's always been the case with Chanels and with most EDTs, EDPs, and parfums, and it's frequently mentioned or alluded to in perfume books and perfume histories. Furthermore, there are always technical issues involved when you move up in concentration. It's not simply a matter of bumping up the levels of perfume oils, as most people imagine, especially for complexly formulated fragrances such as Chanels.
I suspected as much, when I started to really focus my attention on a scents different variations - it's nice to read someone confirming this.
Perhaps the same holds true for some of the 'newer' marketing ideas that scents have now: a regular scent and then a little later an Extreme scent (or an oil). Same concept as edt, edp, parfum - just a different marketing angle, but both with entirely different formulations.
Another thing that has come to mind when I think of formulations from the same fragrance: whenever I read about a new scent coming out with a Summer version, or a limited edition version I always wonder
if the nose who created the scent perhaps in production came up with more than one formula and the company who was releasing the scent liked all three, chose the best one to be released as the Regular version and then kept the other two formulations for later versions.