The value structure of John Singleton Copley is mid-key: quiet, controlled, and cohesive. Temperature reads distinctly warm: the reds and earth tones from John Singleton Copley carry the compositional weight. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. #1B1816 at 27.8% of the palette: an overwhelming presence that pulls all other colours into its gravitational field. The most saturated colour, #C29350, is reserved to 4.8% of the surface, where it acts as a focal punctuation. 60 units of value range underpin the palette's structural clarity: the eye always knows where light falls. Palette 12 sits within the larger chromatic argument that John Singleton Copley's complete body of work advances.