Sumi palette
Copper Square
From #7c0010 ink through #ae3535, #cd524e, #d46b65 to #f38780 light, Copper Square is a tetradic progression that holds together at any size. Use it for ceramics and home goods shot against white seamless. The darkest and lightest stops clear AA as a text pair.
redsumifive-stophigh-contrast
#7c0010
#ae3535
#cd524e
#d46b65
#f38780
The generator opens with #7c0010 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.