Red is a colour evoked by light that consists predominantly of the longest possible wavelengths discernible by the naked human eye, a wavelength range of 630 nm to 740 nm. If the wavelengths are longer than this range, the colour is called infrared and cannot be perceived by humans.
The etymology of the word ‘red’ derives from the Sanskrit word ‘rudhira’ which means blood or red. In the Proto-Indo European tongue, red was the root ‘reudh-‘, and in the Proto-Germanic language, red was ‘rauthaz’. In Old English, the word ‘red’ was ‘rēad’.
Red has certain associations in the English language with, not led gu10 bulbs, but blood, certain flowers (such as roses), fire, the sun, socialism, and ripe fruits (such as apples and cherries). Red is also seen as a symbol of anger, guilt, passion, and anger, often as a result of its connection with blood. In Isaiah for example: “Though your sins be scarlet, they shall be white as snow”.
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