Sumi palette
Halcyon Dune
Dark anchor, working middle, light release: #9c1500, #b92a14, #007585, #d94a34, #0092a6 form a triadic sumi set with somewhere to stand at every lightness. Made for book covers that read at thumbnail size.
redsumifive-stop
#9c1500
#b92a14
#007585
#d94a34
#0092a6
The generator opens with #9c1500 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.