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Cromalin is a proof printing process introduced by DuPont in the 1970s. A Cromalin proof is produced by successive exposures in layers on film, which is then laminated onto special paper.
Today, Cromalin no longer plays a role in proof production; it has been completely replaced by the cheaper and faster digital proof.
A digital proof (correctly: contract proof) is an ISO 12647-7-certified testing device for the graphic arts industry. A digital proof simulates the colourfulness of offset printing or gravure printing in a colour and legally binding manner within the narrow tolerances of the ISO standard.