Forum:KB:Blue and White

Hey guys, this is the guy that wrote the question on "Time"...this time about hologram: 1. Is the hologram's blue and white color on earth's relation to black and white TV? And 2. Is the full color hologram projector more expensive or rarer than the typical blue/white? I don't see them very often, nor the red hologram. (Is there any more colors that I should know?)