The Story
Why it exists.
The beginning
Study No. 23 arrived in 2016 as part of Miller et Bertaux's ongoing study series, compositions numbered, named with subtitles, treated as research rather than product. The brand calls it a newsletter from India, which sounds like a metaphor until you smell it. Then it makes perfect sense. This is India as sensory memory: incense smoke curling in a small shop, the light at the edge of evening, flower garlands and saffron-stained fingers. Miller et Bertaux builds each study as an olfactory postcard, and this one maps to a specific place and hour, the quiet decline of a day spent somewhere warm and unfamiliar. The name is the concept: correspondence from a destination that doesn't explain itself.
What makes Study No. 23 unusual is the way the aldehydes behave. Most fragrances use aldehydes for a bright, powdery opening that fades quickly, a courtesy, then a handoff. Here, the aldehydes don't disappear. They settle into the heart alongside the smoked wood, their effervescence cooling the smoke rather than vanishing beneath it. The result is an opening that fizzles like coriander or crushed myrtle, then transitions into embers rather than the typical aldehydic fade. Immortelle bridges the two phases with its honeyed, slightly medicinal quality, neither bright nor dark, but somewhere in between.
The evolution
The opening is the showstopper. Fennel and aldehydes create a fizzy, almost champagne-like effervescence that surprises. There's a crunch to it, a brightness that seems to come from a different fragrance entirely. One reviewer called it "coriander fizz, cola pop", not wrong. Then the aldehydes settle, the fennel softens, and smoked wood arrives like embers cooling. Immortelle comes forward with its honeyed, slightly medicinal quality, and for a moment the fragrance is warm and resinous without being heavy. The drydown is where it lives. Frankincense, sandalwood, patchouli, and Himalayan cedar build slowly, the moss adding an earthy, forest-floor quality. The base doesn't project, it stays close, intimate, a quiet presence that refuses to leave. Eight to ten hours on most skin. The next morning there's still something there: cedar and resin, the ghost of the evening.
Cultural impact
Study No. 23 is Miller et Bertaux's most popular fragrance according to community ratings. It's the one that converts people who thought they didn't like the house. The aldehydic opening sets it apart from the typical smoky-incense composition, and the long drydown makes it a quiet, persistent companion for those who choose it.
