Theodule Ribot is built on dark foundations, with values clustered toward shadow. A distinctly cool atmosphere runs through this palette: sky, water, and mist given colour form. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. #15140F at 28.7% of the palette: an overwhelming presence that pulls all other colours into its gravitational field. Only 1.8% is devoted to #866730, yet that small allocation delivers the palette's entire chromatic tension. 61 units of value range underpin the palette's structural clarity: the eye always knows where light falls. Together these qualities place Theodule Ribot firmly in the tonal tradition - concerned with mood and atmosphere rather than chromatic display. This is palette 5 of Theodule Ribot's sequence - a single chapter in a chromatic story told across many works.