Well, if you’re only doing black and white photography, you can have dim red lights on once you’ve processed the film into negatives. Black and white photographic paper isn’t affected by red light. Color photography is a whole different beast, and all the steps need to be done in complete darkness.

I guess the one thing said about darkrooms is, “Even when you think you’ve blocked all the light, there’s something you missed that’s gonna ruin your first roll of film.”