Man those white Egyptians were sure dirty b*st*rds!

Yul Brynner does not look white, all the Egyptian characters were applied with a light bronzer and make-up to make them look like real Egyptians, the only really dark Egyptians would have been the slaves who worked out in the fields and got a lot of sun on them, some of the slaves probably would have been as dark black as the Nubian characters in the earlier scenes, but royals stayed shaded, so they're pretty much the correct color in the movie.