Wrinkle grain

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Wrinkle grain of a black and white negative film: The film is darker at the cracks

The wrinkle grain is an effect in photography .

Reticulation is a mistake that in the development of films may occur. It usually arises from excessive temperature differences between the individual baths in the manufacturing process. This creates many hairline cracks in the gelatin layer . The risk of the formation of wrinkled grains increases with the level of processing temperatures and with the length of time spent in the individual baths, as this causes the gelatine to swell more and become more susceptible.

Occasionally, the result of this reaction is also used deliberately as a graphic effect and is used to reproduce the original as closely as possible when collotype printing .