There's a few 'kinds' of red-green colorblind as I understand it. It has to do with whether you're missing a type of cone, or whether the frequency response of a cone type is shifted. I knew someone who had never experienced what others call "green" - all things supposed to be green are brown. I on the other hand see some green things, but a lot of things other people call green are brown, maroon or even purple. Pastels are the worst.