Sumi palette
Halcyon Shrine
From #820001 ink through #b6352a, #d55345, #dc6d5e to #fc8979 light, Halcyon Shrine is a tetradic progression that holds together at any size. Use it for flower-shop wraps and delivery van livery together. The darkest and lightest stops clear AA as a text pair.
redsumifive-stophigh-contrast
#820001
#b6352a
#d55345
#dc6d5e
#fc8979
The generator opens with #820001 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.