I knew this color blind guy once — he wore a pink shirt, and I made light of it, since it was the kind of pink that one can only get by including a red t-shirt in with the whites. I felt terrible when he told me that he didn’t even know he was wearing a pink shirt because he was colorblind.
Well, if you want to know what living like him was like, or you want to tailor your website so it’s not completely unreadable by the colorblind, check out this handy color blindness compatibiltiy chart that lets you pick the color you want to use and then see what it looks like to those with Tritanopy or Deuteranomoly. Incidently, about 10% of all men are color blind in some way.