Which color combination is used for beacons in marking sets?

Which color combination is used for beacons in marking sets?

• A. Red and Blue
• B. Green and White
• C. White and Infrared
• D. Yellow and Black

Answer: (C)

Beacons for marking sets are designed to be noticed in a variety of conditions, so they use signals that can be detected by both people and equipment. The combination of white light and infrared provides that dual visibility: white is bright and easy to spot with the naked eye during the day, while infrared can be detected by night-vision devices, cameras, or sensors even in low light or obstructed conditions. This makes the beacon reliably detectable whether you’re on the ground observing directly or using gear that reads infrared signals. Other color pairs don’t offer that same versatility. Red and blue are highly visible to the eye but don’t extend to infrared detection, green and white rely on visible spectrum only, and yellow and black are high-contrast patterns often used for warnings rather than beacon signaling that needs infrared visibility.

Beacons for marking sets are designed to be noticed in a variety of conditions, so they use signals that can be detected by both people and equipment. The combination of white light and infrared provides that dual visibility: white is bright and easy to spot with the naked eye during the day, while infrared can be detected by night-vision devices, cameras, or sensors even in low light or obstructed conditions. This makes the beacon reliably detectable whether you’re on the ground observing directly or using gear that reads infrared signals.

Other color pairs don’t offer that same versatility. Red and blue are highly visible to the eye but don’t extend to infrared detection, green and white rely on visible spectrum only, and yellow and black are high-contrast patterns often used for warnings rather than beacon signaling that needs infrared visibility.