Heat, light, and air oxidize the materials in a perfume. A bathroom shelf is a small oven with a steam cycle. The original bottle, closed, in the dark, in a closet that stays ordinary room-cool, is the storage that matches the chemistry.
Fragrance formulas are mixtures of volatile organics that oxidize and break down faster with heat, ultraviolet light, and oxygen. Storing the original, closed bottle in a dark, temperate place slows that. A bathroom, a car, or a windowsill speeds it up. You cannot freeze a cheap citrus into an extraits, and you cannot rescue a bottle that has already gone sharp and metallic by moving it to a closet.
Sample on your skin, not a paper strip, and wait for the dry-down. For daily wear, choose something that still smells like itself at hour two in a room with other people, at a dose of one or two sprays.
Eau de parfum and eau de toilette describe rough concentration ranges, not fixed percentages. One brand's toilette can be stronger than another's parfum, because the terms are convention, not regulation.
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