Sumi palette
Ashen Square
From #ac374e ink through #ab4000, #8d5b00, #cb5367 to #ca5c2a light, Ashen Square is a split-complementary progression that holds together at any size. Use it for book covers that read at thumbnail size.
redsumifive-stop
#ac374e
#ab4000
#8d5b00
#cb5367
#ca5c2a
The generator opens with #ac374e as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.