Colour balancing filters are photographic filters used to adjust the light reaching colour film so that it matches the film's intended colour temperature. By correcting differences between the light source and the film type, these filters prevent unwanted colour casts and ensure accurate colour reproduction. Photographers commonly use them when shooting under artificial lighting, mixed lighting conditions, or when trying to maintain consistent colour tones across different environments. Proper use of colour balancing filters helps produce vibrant, natural-looking photographs with faithful representation of the scene's true colours.