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- (transitive) To make hard; harden up.
- 1572, Golding, Calvin:
- They become forhardened, and shaking of the fears of God, do therewithal cast away the hope of salvation.
- 2004, M. Kevin Johnson, c-22 to B&W - Photo.net Film and Processing Forum:
- With the old C-22 chemicals you had to "forharden" the film in order to not have the emulsion come off durring processing.