Not a Perfume, created by renegade design house Juliette Has a Gun, has persistently defied easy dismissal since its introduction in 2010. As befits its unique name, Not a Perfume defies the conventions of women's fragrances. Eschewing traditional base notes-let alone the higher accords of a typical fragrance-this scented emollient has only a single active ingredient, ambroxan. What was originally intended as a stopgap replacement for gray amber has become, what is said to be, the world's only totally hypoallergenic romantic fragrance.