Guercino works almost entirely in the lower half of the value scale, privileging depth over brilliance. The dominant temperature is warm, with earth tones and fire-hues setting the emotional key. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. 27.1% of the palette belongs to #1D1817, a concentration that makes it the unmistakable visual centre. Only 3.6% is devoted to #A26D4B, yet that small allocation delivers the palette's entire chromatic tension. The full value range is 67 units: broad enough to build convincing three-dimensional form. Together these qualities place Guercino firmly in the tonal tradition - concerned with mood and atmosphere rather than chromatic display. In the context of Guercino's full range of palettes, group 9 represents one movement in an ongoing chromatic dialogue.