The value structure of Franz Ludwig Catel is mid-key: quiet, controlled, and cohesive. A distinctly cool atmosphere runs through this palette: sky, water, and mist given colour form. Every colour is desaturated; the palette proceeds through near-neutrals and gently-coloured greys. The highest-chroma note - #51331A - appears at just 6.8%, deployed as a precision accent against the quieter ground. The value range spans 63 units across the palette, providing the full gamut from deep shadow to near-white and ensuring clear tonal hierarchy. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. The palette is recognisably Franz Ludwig Catel's own: particular in its temperature, chroma, and the economy of its brightest note.