Fromfor- +harden. Compareforhard.
forharden (third-person singular simple presentforhardens,present participleforhardening,simple past and past participleforhardened)
- (transitive) To makehard;harden up.
1572, Golding,Calvin:They becomeforhardened, 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 during processing.
