Predicted powder colour (sRGB hex and CIE L*a*b* under D65) for eight known pigments under five band-gap treatments, plus five YInMn-family cells. One row per pigment and method, with the gap that method used and the measured gap. ABACUS v3.10.1 LCAO (DZP) with PYATB independent-particle optics, Kubelka-Munk with a 1 micron scattering length.