The high-key values of Gustave Loiseau give it an effulgent, almost bleached quality. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. The saturated accent, #637849, registers at 8.9% - sparse enough to feel like a deliberate surprise. The value range of 51 units sits in the comfortable middle: enough depth, enough light, neither extreme. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. Gustave Loiseau's palette 5 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.