Mid-key values give Marie Duhem its characteristic quietness - nothing blazes, nothing disappears. Marie Duhem balances warm and cool with remarkable evenness, giving the composition its characteristic vibrancy. A restrained, mid-chroma palette: every hue is present and legible, but nothing shouts. The saturated accent, #D9B67B, registers at 9.0% - sparse enough to feel like a deliberate surprise. Value range is moderate at 45 units - enough contrast for legibility, not so much as to fragment the tonal unity. Together these qualities point to the open-air Impressionist method: recording light rather than local colour. In the context of Marie Duhem's full range of palettes, group 4 represents one movement in an ongoing chromatic dialogue.