SPECTRUM
Spectrum is a condition that is not limited to a specific set of values but can vary infinitely within a continuum.
A spectral color is a color evoked by a single wavelength of light in visible spectrum, or by a relatively narrow bands of wavelengths. Every wavelengths of light is perceive as a spectral color, in a continuous spectrum. The color of sufficiently close wavelengths is indistinguishable.
The spectrum is often divided up into named colors, through any division is somewhat is arbitrary and the spectrum continuously. The traditional color include red, orange, yellow, green, blue and violet.
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