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Gelatin is a mixture of protein-derived chains obtained from collagen through processes that disrupt and partly break down its original structure. It is not one protein molecule with a single fixed sequence and molecular mass.

On cooling a suitable solution, segments can associate into a physical network that traps water. Chain-size distribution, concentration, and thermal history affect the resulting gel, connecting molecular processing with bulk texture.

A photographic emulsion is a coating that responds to light to record an image in photography, for example on a photographic plate. Silver halide crystals, commonly silver bromide, are dispersed in gelatin. Exposure leaves a latent image. A developer produces dark silver grains and fixing removes remaining sensitive material. A microscope can reveal a charged particle's path through the coating: the basis of nuclear emulsion particle detection.^[ref]