The White-and-black Cat.

This differs entirely from the black-and-white cat, as just explained, and is the opposite as regards colour, the ground being white instead of black, and the markings black on white. For exhibition purposes and points of excellence, no particular rule exists beyond that the exhibit shall be evenly marked, with the colour distributed so as to balance, as, for example: If a cat has a black patch just under one eye with a little above, the balance of colour would be maintained if the other eye had a preponderance of colour above instead of below, and so with the nose, shoulders, or back, but it would be far better if the patches of colour were the same size and shape, and equal in position. It might be that a cat evenly marked on the head had a mark on the left shoulder with more on the right, with a rather larger patch on the right side of the loin, or a black tail would help considerably to produce what is termed "balance," though a cat of this description would lose if competing against one of entirely uniform markings.

Fonte: Cats