The value structure of Charles Rennie Mackintosh is mid-key: quiet, controlled, and cohesive. Heat pervades this palette; warm chromatic identities outweigh cool ones at almost every weight. All colours lean toward grey, building depth through value rather than colour punch. The saturated accent, #E2DAC9, registers at 3.5% - sparse enough to feel like a deliberate surprise. The full value range is 57 units: broad enough to build convincing three-dimensional form. In the context of Charles Rennie Mackintosh's full range of palettes, group 6 represents one movement in an ongoing chromatic dialogue.