William Rowell Derrick occupies the comfortable middle of the value scale, avoiding both extremes to hold the eye in a sustained middle grey. Cool hues prevail: blues, greens, and greys anchor the palette's emotional temperature. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. At 8.5%, #B19052 carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. Spanning 33 units on the value axis, the palette achieves the balance between tonal flatness and fragmentation. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. Taken together, these qualities constitute William Rowell Derrick's chromatic voice - distinctive enough to be read across an entire body of work.