Sumi palette
Copper Granary
From #a81939 ink through #d65162, #f66e7c, #fc8791 to #ffb6ba light, Copper Granary is a tetradic progression that holds together at any size. Use it for hotel key cards and lobby signage in one system. The darkest and lightest stops clear AA for large text.
redsumifive-stop
#a81939
#d65162
#f66e7c
#fc8791
#ffb6ba
The generator opens with #a81939 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.