Louis Abel-Truchet keeps values measured and balanced, a hallmark of tonal restraint. Louis Abel-Truchet builds on cool foundations: the palette favours the blue-cyan-green arc. All colours lean toward grey, building depth through value rather than colour punch. The highest-chroma note - #6C7A4D - appears at just 10.3%, deployed as a precision accent against the quieter ground. The full value range is 63 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. In the context of Louis Abel-Truchet's full range of palettes, group 4 represents one movement in an ongoing chromatic dialogue.