Definition of «colour spectrum»

The phrase "colour spectrum" refers to all the colors that can be seen by the human eye, ranging from red to violet.

When done well, using colours from the whole colour spectrum can look incredibly striking. (idealhome.co.uk)
Additionally the palette itself has cooler tones in them that seem to range from the same colour spectrum. (chocolateandlipstick.com)
Seeing a clear colour spectrum, I wanted to go all out on that. (themolook.dk)
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