David Roberts is high in key: pale, luminous, and filled with optical air. The palette achieves thermal balance - reds and blues, ochres and greens, each holding the other in check. Mid-saturation across the board: the palette has colour character without chromatic excess. At 8.6%, #8B6036 carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. From deepest dark to palest light, the palette traverses 57 units of the value scale - a span that creates natural depth. The combination of mid-to-high key, balanced temperature, and elevated chroma is characteristic of Impressionist observation: light broken into its component hues. Palette 4 sits within the larger chromatic argument that David Roberts's complete body of work advances.