Luca Signorelli is low-key throughout, a quality associated with Nocturnal Bister - deep shadows dominate the composition. Yellow, ochre, sienna: warm hues that Luca Signorelli deploys as the palette's primary energy. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. The highest-chroma note - #82432D - appears at just 6.5%, deployed as a precision accent against the quieter ground. The value range spans 61 units across the palette, providing the full gamut from deep shadow to near-white and ensuring clear tonal hierarchy. This tonal restraint is characteristic of the Luca Signorelli approach: colour serves light, not the reverse. This is palette 11 of Luca Signorelli's sequence - a single chapter in a chromatic story told across many works.