Physics is there to help us, especially for what concerns light. Red + green + blue = white. Light is not… well paint for instance :D
You may be amused (or not in fact) that in quantum chromodynamics, elementary quarks are green, red or blue and when three quarks of three different colours combined into a composite particle, the latter is white, and not black. It is similar to light painting ;)
Thanks tor this interesting blog! Cheers!
Cheers :-)