Do individual photons of light each contain all the colors of the light spectrum or is each single photon a single color?
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A photon has a wavelength, and when a certain wavelength of light hits our eyes, we see it as a color. A mix of different wavelengths appear to us as other colors; and a whole bunch of different wavelengths together looks white.
Each photon, though, is just one wavelength; a single “pure” color. The thing is, though, the wavelength / color can change. For example, if you move towards it, the wavelength is shorter and color shifts bluer; move away, the wavelength and color shifts redder.
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