A Recessive Pied Split is going look like a normal with perhaps a small white dot of feathers on the back of the head. The spot is not always present so we use split plastic bands to ID. Any bird that is "split" means it carries a hidden factor that when matched to a visual or another split will produce at least some of the factor it was split for. Many breeders use splits to increase the size of the visual line, especially in rare varieties. The hidden factor has to be in both hen and **** for it to show as a visual chick.
A show quality recessive pied will be white -yellow-yellow face- with as few as possible spots on back and wings and smaller spots are better. It will have a band of color on the chest-blue or green phase- it may or may not have spots on mask near the cheek patches. Hens tend to be more heavily marked than cocks.
We breed recessive pied splits by pairing dark-eyed clearsor recessive pieds to normals again to increase size down the road. Once you get a good sized split you breed it back to a dark eyed clear and you then have the potential of getting dark eye clear, recessive pied, clearflight pied and frosted clearflight and more splits.These are not dominant pieds which are a different variety. it is best not to breed these together as it causes confusion for classifacation. I have gotten all types in one clutch, but this is not usual as genetic percentages are based on one hundred pairings-This makes a little mystery as we watch the babies develop. Baby recessives look white or yellow with tiny dark spots along wings when they are very young. Dark eye clears are white -yellow -or yellow face with normal dark eyes-not red like albinos or lutinos or inos. They have no spots on mask or other markings- thus "clear" color.
I hope this helps. Good luck with the aviary. It would be good to find a nearby champion breeder who will act as a mentor to ask questions and help with emergencies.
It just occurred to me that you can find specific info on all of the types of Budgie mutations in little books from the World Budgiregar Assoc in England.
If you live in US or Canada check out the American Budgiregar Society web sitewhere they sell many of the same books and the postage is cheeper than ordering from England.
I understand the folks in UK have huge bird shows. Here in US our Budgie shows have only a few hundred birds, but our shows are all over the country which is a travel headache for people and birds.
I have read almost everyone of them and still have tons of questions. I am a new breeder so I depend a lot on Experienced Champion breeders. When It comes time to pair the birds for breeding. I write a proposal and then show it to my mentor who then explains the potential results and why or why not a good choice and then suggest alternatives. I am so greatful for her help.