Depends entirely what the white is masking. White Leghorns are usually Black birds with Dominant White, but may also mask Barring,Blue, or Columbian. The first cross would give all white birds, but the F1 mating could give White,Black,Cuckoo,Blue,White tailed Red, White tailed Red Cuckoo,White tailed Gold,White tailed Gold Cuckoo,White tailed Blue Red,White tailed Blue Red Cuckoo,White tailed Blue Gold Cuckoo,White tailed Blue Gold ,Black tailed Red, Black tailed Red Cuckoo,Black tailed Gold,Black tailed Gold Cuckoo,Black tailed Blue Red,Black tailed Blue Red Cuckoo,Black tailed Blue Gold Cuckoo,Black tailed Blue Gold , and all of these colours as Blue tailed varieties, Pyle, Barred Pyle,Red Duckwing,Blue Duckwing, both as Cuckoos,Gold Duckwing,Crele,Blue Crele .all depends on what is in the genome of the White & how many chicks you hatch.
David