Sumi palette
Iris Square
Five stops tuned to sit together without fighting — #8c2600 ink anchors the set, #fda187 opens it up, and #b85437, #d76f52, #de856b cross the middle in a tetradic arrangement. Iris Square suits bike-shop liveries that survive mud and sun. The darkest and lightest stops clear AA for large text.
redsumifive-stop
#8c2600
#b85437
#d76f52
#de856b
#fda187
The generator opens with #8c2600 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.