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A spectrometer, or your eyes. Each color is a different wavelength, if you learn what the wavelengths are for different colors, eventually, you can estimate fairly accurately by sight. In order to identify color, you need a spectrometer and another information source. The information source would be a listing of wavelengths that correspond to a color. In chemistry, you cannot just use your eyes to determine a color, because color is an opinion that can vary between people. Instead, you use the spectrometer to find the wavelength, then determine what color the light is using a wavelength/color chart.

The visible light spectrum is between 400nm - 700nm. A good chart and background info is:

<http://www.cem.msu.edu/~reusch/VirtualText/Spectrpy/UV-Vis/spectrum.htm>

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