Briton Riviere occupies the comfortable middle of the value scale, avoiding both extremes to hold the eye in a sustained middle grey. Heat pervades this palette; warm chromatic identities outweigh cool ones at almost every weight. 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 - #B87F41 - appears at just 5.6%, deployed as a precision accent against the quieter ground. Value range is moderate at 50 units - enough contrast for legibility, not so much as to fragment the tonal unity. In the context of Briton Riviere's full range of palettes, group 4 represents one movement in an ongoing chromatic dialogue.