A tripack is a photographic film construction that consists of three emulsion layers, each with different light sensitivity, mounted on its own base. This design enables the creation of three separation negatives from a single exposure, capturing distinct tonal or colour information in one shot.
Tripacks are commonly used in colour photography, scientific imaging, and archival reproduction, where precise separation of tones or colours is essential. By understanding and using tripacks, photographers can produce accurate, high-quality separation negatives suitable for printing, analysis, or advanced photographic processes.