Low-key values are the structural spine of Paul Serusier, giving it gravity and atmosphere. Warmth dominates - the palette of Paul Serusier leans heavily on the yellow-orange-red arc of the colour wheel. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. #1C131A claims 34.8% of the surface, functioning as the work's tonal foundation. At 1.1%, #E9E4CD carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. A value spread of 74 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. The combination of low values, muted chroma, and compressed range is the signature of the Tonalist mode - painting as atmosphere. Palette 9 sits within the larger chromatic argument that Paul Serusier's complete body of work advances.