Pick two or three perfumes and see how they wear together: a score, the notes that bridge them and which one goes on first.
Pick two perfumes to see how they layer.
Wearing two or more perfumes on top of each other to make a scent of your own. It works best when the two share a note, or when their notes are ones that sit well together.
Put a simple scent (a single-note neroli or rose, say) over a complex one, so that note comes forward in it.
Two perfumes from the same family with a small difference, like two jasmines where one is smokier.
Two opposites, like a cool green scent with a sweet one. When it works, it's the most interesting of the three.
50 is an ordinary pair, like two perfumes picked at random. The higher it goes, the more their notes are the kind perfumers put together.
80 and up: wear well together. 65 to 79: good match. 45 to 64: worth a try. Below 45: a bit risky.
What's not in it: a real wear test, shops' opinions, or ads. No shop has any say over these scores or suggestions.
Wearing two or more perfumes on top of each other to make a scent of your own. The perfumes don't need to be expensive or rare; what matters is that their notes go together.
Usually the heavier, longer-lasting one (woody, amber, vanilla) goes on first, underneath, and the lighter one (citrus, floral, fresh) on top, so the lighter scent isn't buried. The tool above suggests the order for each pair.
Two to start with. Three works too, but it gets crowded quickly. The tool above checks up to three and tells you which one pulls the mix down.
Two very loud perfumes usually add up to too much, and a very summery scent rarely works with a very wintry one. Some notes also seldom meet; the tool finds those pairs across thousands of perfumes and shows them to you.
On skin, body warmth opens the scents up and they blend. On clothes they last longer but change less. A good rule: the heavier one on skin, the lighter one on clothes. Be careful with light colours and silk, perfume can stain.
Spray each on its own paper strip and hold them together, or spray the first on your wrist and the second over it. Wait a few minutes: the opening of a perfume changes fast.