What color of chemical light is attached to deck edges?

The correct answer is red because red chemical lights are specifically used for marking hazards and indicating areas of danger, such as deck edges where there is a risk of individuals falling overboard or tripping. The use of a red light is universally recognized as a warning signal, making it vital for ensuring safety on deck, especially during nighttime operations or poor visibility scenarios.

In naval operations and boating safety, different colors of chemical lights serve distinct purposes to signify various warnings or instructions. While white lights may be used for general illumination, and blue or yellow lights can denote different types of operational statuses, red lights are particularly effective in alerting personnel to potential hazards near deck edges. By establishing a clear visual cue with red lights, it helps ensure that crew members remain vigilant, reducing the risk of accidents.