Colour Index is a photographic investigation that isolates raw pigment as an autonomous spatial and material entity. Presented as a disciplined multi-panel grid, the series examines viscous fields of hyper-saturated magenta, using macrophotography to capture fluid striations, surface tension, and chromatic density. By stripping colour of its representational function, Colour Index transforms liquid pigment into a tactile visual architecture. The archival framing contrasts the volatile nature of the fluid medium with a rigorous taxonomic structure, establishing a dialogue between scientific cataloguing and pure painterly abstraction.