Hippolyte Petitjean is high-key - luminous, open, and weighted toward light. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Colours are neither washed out nor blazing; they occupy the productive middle ground of the chroma scale. The most saturated colour, #F4CD40, is reserved to 7.8% of the surface, where it acts as a focal punctuation. 17 units of value range: compressed and intimate, the kind of tonal closeness associated with candlelight or overcast skies. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. Palette 1 sits within the larger chromatic argument that Hippolyte Petitjean's complete body of work advances.