Sumi palette
Overcast Crater
Dark anchor, working middle, light release: #982700, #b6360c, #00768b, #d55430, #0093ad form a tetradic sumi set with somewhere to stand at every lightness. Made for museum exhibition graphics with long sightlines.
redsumifive-stop
#982700
#b6360c
#00768b
#d55430
#0093ad
The generator opens with #982700 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.