If you are talking about adding colors, you need to add both red and green to blue to make white. I agree that color theory is quite confusing. You have to distiguish between additive and subtractive combinations.
TV screens add colors and mix red, bue and green (equal amoounts make white). Ink jet printers and paints subtract light and mix yellow, magenta and cyan as primary colors (equal amounts make black).
white liht is produced by blue light and what other liht?
I think it's yellow, but I'm not even sure behind my reasoning. I could really just use some help on this; I've been trying to find a good website to explain the whole color theory, but so far what I've found is pretty incomplete.
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