Push processing is a film development technique in which the development time is extended to compensate for underexposure, often caused by using a higher ISO setting than the lighting conditions allow. By “pushing” the film, the latent image receives additional chemical development, increasing density and contrast in the final negative.
This method is commonly used in low-light situations or when faster shutter speeds are needed. Push processing allows photographers to achieve usable images under challenging conditions while controlling tonal range and contrast, though it may increase grain or alter the films natural characteristics.