The value structure of Raphael Kirchner is mid-key: quiet, controlled, and cohesive. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Colours are neither washed out nor blazing; they occupy the productive middle ground of the chroma scale. The highest-chroma note - #6B522D - appears at just 9.9%, deployed as a precision accent against the quieter ground. At 59 units of value range, the palette has the tonal breadth to sustain complex spatial readings. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. In the context of Raphael Kirchner's full range of palettes, group 18 represents one movement in an ongoing chromatic dialogue.