When I was last in any form of education, the tutors used 2 boards. One was coloured black (and historically called a blackboard until PC came in) and was described in class as a chalkboard. The other was white and oddly enough, rather than being called a pen board (after all this one used pens and the other used chalk) was called a white board.

I've just realised that indicates unfair discrimination against black. I mean you can call a useful teaching device that is coloured white as white but you can't call a useful teaching device that is coloured black, black.

My point is, if you want to invent cases to prove discrimination, you can do. I find it makes a mockery of genuine cases though.