Darkroom

Room which can be made fully dark to allow for development of photographs and film

A darkroom is used to process photographic film, make prints and carry out other associated tasks. It is a room that can be made completely dark to allow the processing of light-sensitive photographic materials, including film and photographic paper. Various equipment is used in the darkroom, including an enlarger, baths containing chemicals, and running water.

This keyword could refer to multiple things. Here are some suggestions: