Dark cure / post-cure.

Polymerization that continues after the print or part is out from under the UV source, so what comes off the line has not yet reached its final hardness or adhesion. It is a cationic effect, not something to expect from the acrylate free-radical inks most UV printers run: free-radical cure needs continuous line-of-sight exposure and terminates in a fraction of a second, while a cationic system needs the lamp only to start it and then propagates for minutes, hours or even days. Post-cure is the wider word and carries a second meaning worth keeping straight: a deliberate secondary exposure, such as taking LED-cured chemistry to a UVC source, which you schedule rather than wait out. Test a cationic job the instant it leaves the lamp and the answer is wrong in both directions. Good work gets scrapped on an adhesion test it has not had time to pass, and a job cleared too early ships with its properties still moving, which comes back as a customer complaint.