Carlo Bossoli is high in key: pale, luminous, and filled with optical air. Yellow, ochre, sienna: warm hues that Carlo Bossoli deploys as the palette's primary energy. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. The dominant colour, #FCFBF9, takes 25.7% of the total area, establishing the overall mood before any other hue is introduced. The highest-chroma note - #E5CB91 - appears at just 4.4%, deployed as a precision accent against the quieter ground. A value spread of 71 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. Carlo Bossoli's palette 4 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.