Mid-key values give Gustave Moreau its characteristic quietness - nothing blazes, nothing disappears. Warm and cool are kept in productive tension, creating the kind of chromatic harmony that sustains the eye. Every colour is desaturated; the palette proceeds through near-neutrals and gently-coloured greys. Only 7.1% is devoted to #915427, yet that small allocation delivers the palette's entire chromatic tension. A value spread of 58 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. Gustave Moreau's palette 13 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.