Low-key values are the structural spine of Pierre-Narcisse Guerin, giving it gravity and atmosphere. A distinctly cool atmosphere runs through this palette: sky, water, and mist given colour form. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. The saturated accent, #71312B, registers at 2.5% - sparse enough to feel like a deliberate surprise. A value spread of 63 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. The combination of low values, muted chroma, and compressed range is the signature of the Tonalist mode - painting as atmosphere. This is palette 7 of Pierre-Narcisse Guerin's sequence - a single chapter in a chromatic story told across many works.