Whether the darkroom is light tight can be determined by __

### Closing the door and turning off all the lights including the Safelight

## Step1: Identify the darkroom### A darkroom is a room where photographic prints are processed and developed. It is crucial to ensure that the room is light tight to prevent the film from being exposed to light, which can ruin the prints.## Step2: Close the door### Closing the door of the darkroom is the first step to ensure that no external light can enter the room. This is important because even a small amount of light can affect photographic materials.## Step3: Turn off all lights### Turning off all the lights in the darkroom, including the safelight, is the next step. The safelight is a special type of light used in darkrooms to allow photographers to see their work without affecting photographic materials. However, it should be turned off when not in use to maintain the light tight condition of the darkroom.