What's it like to be colorblind?

One of my friends is colorblind, and he can't see red and green. He temporarly got his site back for a little bit, but it was gone after a while.

What's it like to be colorblind? Is the color you can't see just gray? What if it's gray you can't see?

VIVA LA RAZA!
Update: oops, I mean sight, not site.
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