QUOTE (KarmaInferno @ Jul 31 2010, 01:56 PM)

This is true. But even then most colorblind folks have SOME colors they can differentiate. True colorblindness is very rare, even among the colorblind.
Anyone know what colors are considered "usable" for the largest majority of colorblind folks?
I'm colorblind. I just used a blue sharpie on blue dice on the 2,3, and 4 for my stack-o-dice. (one of those 3*3*4 boxes that can even hold a pencil sharpener if you flip the black base upside down)
The 1 is so different from the 5 and 6 that having all white pips isn't an issue. Likewise, the 6 and the 5 are easy to tell apart.
As a guideline, avoid Red and Green (stop is the one at the top of the stoplight). After that, I've heard to avoid blue and yellow, but I've met more people who are completely colorblind than I've met blue-yellow colorblind people.
A quick test is to ask how many colors are on the mountain dew label. Colorblind people aren't likely to know the "Dew" part is in another color.