The value structure of John Henry Twachtman is mid-key: quiet, controlled, and cohesive. John Henry Twachtman builds on cool foundations: the palette favours the blue-cyan-green arc. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. #8D7A55 functions as the palette's exclamation mark: highest chroma, lowest percentage (12.7%). From deepest dark to palest light, the palette traverses 57 units of the value scale - a span that creates natural depth. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. This is palette 13 of John Henry Twachtman's sequence - a single chapter in a chromatic story told across many works.