Gustave Boulanger sits in the centre of the value range, lending the palette a sense of even, sustained light. Gustave Boulanger builds on cool foundations: the palette favours the blue-cyan-green arc. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. The most saturated colour, #D0C7A6, is reserved to 6.4% of the surface, where it acts as a focal punctuation. A value spread of 71 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. In the context of Gustave Boulanger's full range of palettes, group 2 represents one movement in an ongoing chromatic dialogue.