Sumi palette
Kiln Oasis
From #9b0729 ink through #b32a3c, #007478, #d34955 to #009297 light, Kiln Oasis is a analogous progression that holds together at any size. Use it for book covers that read at thumbnail size.
redsumifive-stop
#9b0729
#b32a3c
#007478
#d34955
#009297
The generator opens with #9b0729 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.