Sumi palette
Rocky Foundry
From #c83455 ink through #695eda, #817600, #008684 to #e8536f light, Rocky Foundry is a tetradic progression that holds together at any size. Use it for book covers that read at thumbnail size.
redsumifive-stop
#c83455
#695eda
#817600
#008684
#e8536f
The generator opens with #c83455 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.