The high-key values of Hippolyte Petitjean give it an effulgent, almost bleached quality. 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. #908456 delivers the chromatic peak at only 5.8% - a small shot of colour with outsized visual impact. The palette spans 54 value units: a measured range that delivers coherence over drama. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. In the context of Hippolyte Petitjean's full range of palettes, group 3 represents one movement in an ongoing chromatic dialogue.