Thomas Allom is high-key - luminous, open, and weighted toward light. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Chroma is held at a comfortable level - distinct colours, but no single hue is allowed to overwhelm. The most saturated colour, #CFAC6D, is reserved to 6.7% of the surface, where it acts as a focal punctuation. At 44 units across the value scale, the palette keeps contrast readable without letting it dominate. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. The palette is a signature: Thomas Allom's particular sense of value, warmth, and colour weight made legible.