Petrichor palette
Leaden Delta
Leaden Delta runs #005158 through #007d86, #3398a1, #57a6ad to #74c2ca in five measured steps, the tetradic structure keeping every neighbor honest. Reach for it for book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
cyanpetrichorfive-stop
#005158
#007d86
#3398a1
#57a6ad
#74c2ca
The generator opens with #005158 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.