Low-key values are the structural spine of Francisco de Zurbaran, giving it gravity and atmosphere. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. All colours lean toward grey, building depth through value rather than colour punch. Francisco de Zurbaran gives 37.5% of the composition to a single #1D1B17 - a decisive chromatic anchor. #6E3228 functions as the palette's exclamation mark: highest chroma, lowest percentage (1.5%). From deepest dark to palest light, the palette traverses 56 units of the value scale - a span that creates natural depth. Together these qualities place Francisco de Zurbaran firmly in the tonal tradition - concerned with mood and atmosphere rather than chromatic display. In the context of Francisco de Zurbaran's full range of palettes, group 13 represents one movement in an ongoing chromatic dialogue.