Arthur Hacker is low-key throughout, a quality associated with Nocturnal Bister - deep shadows dominate the composition. Yellow, ochre, sienna: warm hues that Arthur Hacker deploys as the palette's primary energy. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. 41.1% of the palette belongs to #161311, a concentration that makes it the unmistakable visual centre. The highest-chroma note - #DBCAA9 - appears at just 5.2%, deployed as a precision accent against the quieter ground. A value spread of 66 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. Arthur Hacker's palette 6 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.