Sumi palette
Copper Plaza
Dark anchor, working middle, light release: #772200, #b0411a, #cf5d38, #d67456, #f59071 form a complementary sumi set with somewhere to stand at every lightness. Made for bike-shop liveries that survive mud and sun. The darkest and lightest stops clear AA as a text pair.
redsumifive-stophigh-contrast
#772200
#b0411a
#cf5d38
#d67456
#f59071
The generator opens with #772200 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.