John Atkinson Grimshaw occupies the comfortable middle of the value scale, avoiding both extremes to hold the eye in a sustained middle grey. Yellow, ochre, sienna: warm hues that John Atkinson Grimshaw deploys as the palette's primary energy. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. The saturated accent, #A27D3A, registers at 4.2% - sparse enough to feel like a deliberate surprise. A value spread of 57 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. In the context of John Atkinson Grimshaw's full range of palettes, group 13 represents one movement in an ongoing chromatic dialogue.