Wilhelm Leibl is high-key - luminous, open, and weighted toward light. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. The saturated accent, #0D0604, registers at 3.8% - sparse enough to feel like a deliberate surprise. A value spread of 76 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. Palette 1 sits within the larger chromatic argument that Wilhelm Leibl's complete body of work advances.