Art Unwin wrote:
I don't know about waves but my understanding is that all colors come
from the mixing of the three basic colors, or is it four?

That's the RGB standard designed for fooling human
eyes into seeing more than just red, green, and blue.
Photons in nature come in *all* EM frequencies.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com