The Trained Nose

Black Perfecto by La Petite Robe Noire against Black Perfecto by La Petite Robe Noire Eau de Toilette Florale

One number per era rather than one number overall — two fragrances can be near-identical at the opening and different things by the evening, and an average hides exactly that.

How close, and when

Across a whole wearing, Guerlain Black Perfecto by La Petite Robe Noire and Guerlain Black Perfecto by La Petite Robe Noire Eau de Toilette Florale are close. They are nearest during the drydown and furthest apart in the opening, which is the part a single figure would average away.

61% opening · 0–1 h
72% heart · 1–3 h
81% drydown · 3–8 h
Measured across all twenty-four facets, from the notes below — not from the families on the boxes. They share 3 of 13 materials, which is worth holding beside the figures: a pair can share almost nothing and still converge, because different materials can smell of the same things.

What AKIN predicts

AKIN predicts these two are alike, and the evidence behind that is substantial.

Two signals sit on this page and are never averaged: what the note pyramids measure these two to share, and what AKIN’s resemblance graph predicts. Where they part, that is the finding rather than a fault.

The pyramids, side by side

Compared by material rather than by spelling, so a note recorded two ways is not counted as a difference.
top
Black Perfecto by La Petite Robe Noire only — Almond, Black Tea, Sour Cherry
Black Perfecto by La Petite Robe Noire Eau de Toilette Florale only — Rose Water
heart
both — Rose
Black Perfecto by La Petite Robe Noire only — Licorice
Black Perfecto by La Petite Robe Noire Eau de Toilette Florale only — Almond, Red Rose
base
both — Black Musk, Leather
Black Perfecto by La Petite Robe Noire only — Patchouli, Tonka Bean
Black Perfecto by La Petite Robe Noire Eau de Toilette Florale only — Black Tea