Colour sensitivity refers to the responsiveness of photographic film, paper, or digital sensors to light of different wavelengths, corresponding to various colours. A material with balanced colour sensitivity will accurately capture reds, greens, and blues, ensuring faithful colour reproduction. Understanding colour sensitivity is essential in photography, especially when selecting film types, filters, or digital sensor settings, as it affects how colours are rendered under different lighting conditions. Properly matched sensitivity helps photographers achieve natural, vibrant, and consistent images across diverse shooting environments.