If you leave the room, even for a second, secure any light sensitive material. If I walk into an empty workroom, I will assume I can turn the white lights on. Chemical contamination is a serious matter. It can destroy your film, your prints and your clothes. The importance of taking time to wipe clean the work area before AND after you work cannot be overemphasized.
Cleanliness is the only way to prevent contamination and insure print and negative permanence.
We hope you enjoy your time spent in this darkroom. If you have any questions or problems please contact us.