The various colors are specially formulated to enable them to be easily distinguished on the visible light spectrum – for example, the “yellow” signal stick will appear to be the color Yellow. The “Glow in the Dark” signal stick will actually absorb energy from ambient light (particularly ultra-violet light) and then emit that when in low light conditions using special wavelengths which will appear to have a greenish tint using an effect called phosphorescence.

There is no impact on the actual performance as an antenna.