Caucasian or not doesn't matter. Regardless of skin colour, the palms are universally about the same shade.
Now that you mention it, I remember reading that in one of the old books, didn't believe it (being a sheltered country boy with no Telly) 'till I went to school the next day and asked one of the aboriginal kids to show me his hands... Boy was that a lesson in 'we really are all the same underneath'!
My goal in life, is to be as good a person as my dog already thinks I am.