The high-key values of Charles M. Russell give it an effulgent, almost bleached quality. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. The highest-chroma note - #C4A858 - appears at just 2.9%, deployed as a precision accent against the quieter ground. At 70 units of value range, the palette has the tonal breadth to sustain complex spatial readings. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. Palette 4 sits within the larger chromatic argument that Charles M. Russell's complete body of work advances.