Colour development is the chemical stage in the colour photographic processing cycle that transforms exposed film or paper into a full-colour image. During this stage, the colour developer reacts with exposed silver halides and colour couplers to produce the dyes that form the visible colour image. Proper colour development is crucial for accurate colour reproduction, tonal balance, and overall image quality. Photographers and lab technicians rely on precise timing, temperature control, and chemical formulation to ensure consistent, vibrant, and professional-quality colour photographs.