James McNeill Whistler works in the upper reaches of the value scale, creating an atmosphere of brightness and expansiveness. Cool hues prevail: blues, greens, and greys anchor the palette's emotional temperature. A restrained, mid-chroma palette: every hue is present and legible, but nothing shouts. A single dominant - #EBDA9E at 30.2% - sets the character of the whole composition. #542719 functions as the palette's exclamation mark: highest chroma, lowest percentage (2.6%). The full value range is 57 units: broad enough to build convincing three-dimensional form. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. Palette 4 sits within the larger chromatic argument that James McNeill Whistler's complete body of work advances.