Sumi palette
Obsidian Oasis
Dark anchor, working middle, light release: #912138, #a9384b, #007574, #c85464, #009292 form a tetradic sumi set with somewhere to stand at every lightness. Made for hotel key cards and lobby signage in one system.
redsumifive-stop
#912138
#a9384b
#007574
#c85464
#009292
The generator opens with #912138 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.