Pierre Jean Edmond Castan occupies the comfortable middle of the value scale, avoiding both extremes to hold the eye in a sustained middle grey. Pierre Jean Edmond Castan orchestrates warmth above all else - reds, ambers, and siennas take the lead. Chroma is moderate: colours carry enough saturation to be read as colour, but the palette stops well short of garish intensity. The highest-chroma note - #EFC988 - appears at just 3.1%, deployed as a precision accent against the quieter ground. From deepest dark to palest light, the palette traverses 59 units of the value scale - a span that creates natural depth. Palette 4 sits within the larger chromatic argument that Pierre Jean Edmond Castan's complete body of work advances.