Here is an attempt at an explanation of the question very often asked in my mail and that is "Where did this colour youngster come from"
This pairing of Normal x Split is one that unless you know everything about your birds history is often made with no idea one of the pair is a "split" all your offspring will be normal but 50% will be "split "and until at some point ( sometimes many years down the line) that you pair 2 splits together you will probably never know the full genetic history of your birds, unless you bred them, and even then the split birds need test pairing to tell you they are splits.
So hidden away for sometimes many generations split birds can give you either a shock or a pleasant surprise depending on your aspirations.