The high-key values of Art Nouveau give it an effulgent, almost bleached quality. Built on cool foundations: the palette favours the blue-cyan-green arc. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. #6F4430 delivers the chromatic peak at only 3.9% - a small shot of colour with outsized visual impact. The value range spans 66 units across the palette, providing the full gamut from deep shadow to near-white and ensuring clear tonal hierarchy. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source.