Reformulation is much more difficult than it seems, to the point of becoming an integral part of the perfumer’s job. We are often asked to alter a fragrance slightly, make a fragrance more floral, more diffusive, creamier. In the case of reformulation, we have to do the same thing. We have to change the fragrance without really changing it, without losing its character, because some consumers have been buying a perfume for such a long that they know it by heart. So the challenge is to figure out how to change without changing.
— Read more in Olfactory reformulation a delicate exercise at Premium Beauty News.