An ideal color choice for a danger signal should be a color that can be easily viewed and distinguished from a distance. Red is the optimal choice for that.
All the colors are scattered as they pass through air, but this scattering is not the same for every color. The colors with higher wavelengths are scattered less than colors with lower wavelengths. In the light spectrum, violet scatters the most, while red scatters through the air the least due to its longer wavelength. Less scattering means that, compared to other colors, red can be distinctly observed from a long distance by the human eye. This makes the color red ideal for serving as the color of a danger signal.
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