For underwater safety equipment, visibility is crucial. The most effective colors are:
- Fluorescent yellow-green – Most visible in most conditions
- International orange – Highly visible in shallow water
- Hot pink/magenta – Maintains visibility better than pure red
This is why most diving safety equipment and underwater emergency gear uses these colors. Fluorescent yellow-green is particularly effective because it matches the wavelength where human eyes are most sensitive and penetrates water better than many other colors. For this reason, many dive computers, gauges, and emergency signaling devices use this color scheme.