Sumi palette
Frosted Brook
Dark anchor, working middle, light release: #9c0037, #b4274a, #007674, #d44763, #009391 form a tetradic sumi set with somewhere to stand at every lightness. Made for museum exhibition graphics with long sightlines.
redsumifive-stop
#9c0037
#b4274a
#007674
#d44763
#009391
The generator opens with #9c0037 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.