All chickens have black and red (gold). These are the only colors in chickens. All the different patterns and colors depend on either restricting or enhancing these two colors
Ii -- Dominate white. effective in changing black to white but not so good on red e.g. creaminess on whites. Birds with Ii will have some black spots on breast.
cc -- Recessive white --Changes both black and red to white. Working with recessive white can be tricky as it "white washes" a bird. It may have the phenotype of a totally different color or even a nonstandard color underneath the white. The only way to determine what the white is hiding is to mate it to a black bird. You can get barred, polecats, etc.
Blue to Blue = 50% Blue, 25% Splash, 25% Black
Splash to Blue = 50% Blue, 50% Splash
Splash to Black = 100% Blue
Splash to Splash = 100% Splash
Blue to Black = 50% Blue, 50% Black
Craig