Mattia Preti is low-key throughout, a quality associated with Nocturnal Sienna - deep shadows dominate the composition. Warmth dominates - the palette of Mattia Preti leans heavily on the yellow-orange-red arc of the colour wheel. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. A single dominant - #201B19 at 33.8% - sets the character of the whole composition. The saturated accent, #A87F4E, registers at 2.2% - sparse enough to feel like a deliberate surprise. A value spread of 55 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. The combination of low values, muted chroma, and compressed range is the signature of the Tonalist mode - painting as atmosphere. In the context of Mattia Preti's full range of palettes, group 7 represents one movement in an ongoing chromatic dialogue.