ColoursNote that these colours may vary slightly, depending on your browser and operating system. In American English "colour" is written "color" and "grey" is written "gray".
The 7 colours of the rainbowThe seven colours of the rainbow are the "visible" part of the electro-magnetic spectrum - they are visible to (or can be seen by) the human eye. A rainbow is what we sometimes see in the sky when the sun is shining and it is raining somewhere at the same time.
This mnemonic can help you remember the colours of the rainbow and their order: The prefix "infra-" means "below" or "under". Infra-red is "below" the colour red (and not visible). The prefix "ultra-" means "beyond". Ultra-violet is "beyond" the colour violet (and not visible). A few other coloursTechnically, white is not a colour (it is a combination of all colours), and black is not a colour (it is the absence of all colours). But in normal language we usually describe white, black and grey as colours.
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