Petrichor

First five seconds after rain hits dry concrete in a parking lot that hasn't seen water in six weeks.

Notes: Wet clay, limestone dust, geosmin, green bark, mineral water

Use at 8–15% in an EDP base to lead the opening. Pairs well with vetiver, oakmoss, and violet leaf. Particularly strong as a heart accord in earthy or aquatic structures. Avoid blending with sweet or gourmand bases — the contrast reads as dissonance rather than tension.