Why is red the colour of danger?
This article explains why red is universally used as a color for danger, citing its long wavelength and the human evolutionary response to blood and fire. It also notes that color perception is context-dependent, suggesting different danger colors for environments like Mars.
Why it matters
Understanding human color perception and environmental context is crucial for safety engineering and design across different planetary environments.
Red has the longest wavelength of any colour in the visible spectrum, so it is scattered the least by particles in the air, such as fog, rain or dust. Thus, you can see a red sign from further away than, say, one in blue or green.
The content is purely scientific and educational, focusing on physics and evolutionary biology.
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