Light floods Mary Cassatt; the palette keeps values pale and airy across its range. Temperature is cool-dominant, with blue and green families claiming the largest areas. Muted throughout, the palette achieves its effects through value and temperature rather than chromatic force. Mary Cassatt gives 38.1% of the composition to a single #E3D0AD - a decisive chromatic anchor. The most saturated colour, #873A16, is reserved to 4.1% of the surface, where it acts as a focal punctuation. The full value range is 70 units: broad enough to build convincing three-dimensional form. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. This is palette 1 of Mary Cassatt's sequence - a single chapter in a chromatic story told across many works.