Darkness anchors Thomas Buchanan Read; light is rationed, creating dramatic contrast rather than open air. Thomas Buchanan Read builds on cool foundations: the palette favours the blue-cyan-green arc. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. Thomas Buchanan Read gives 29.3% of the composition to a single #30312F - a decisive chromatic anchor. #52311D functions as the palette's exclamation mark: highest chroma, lowest percentage (6.2%). The value range of 50 units sits in the comfortable middle: enough depth, enough light, neither extreme. The combination of low values, muted chroma, and compressed range is the signature of the Tonalist mode - painting as atmosphere. This is palette 4 of Thomas Buchanan Read's sequence - a single chapter in a chromatic story told across many works.