SarahNAlso, a brand new bottle of a fragrance will smell different than an older bottle that's been used for a while, even with no reformulation. The nature of the juice being exposed to air for a longer period of time makes a difference.
Absolutely. 👍 This too can be tested if you have bought two bottles of the same batch and opened the other one a lot earlier. It depends on the type of the fragrance how oxidation affects it - for example citrusy top notes tend to fade and sweet vanilla notes tend to turn deeper and boozier. White flowers, especially when the perfume has a high concentration of naturals, turn more indolic. Some fragrances change more and some don't significantly change at all.