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display_rgb flipped every near-white colour to black on paper and every near-black colour to white on the dark canvas, so ACI 51/255 and true-colour white printed black and dark index colours showed white. Display-list primitives now carry an aci7 flag set when the colour resolves to 7 (directly, by layer or by block); only those flip. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>