I know splash is the result of a blue to blue crossing, so it could be possible. I'm not very knowledgeable in chicken genetics, but I have had the chicken calculator be correct.
Blue x Blue = 50% Blue, 25% Black, 25% Splash
Blue x Black = 50% Blue, 50% Black
Blue x Splash = 50% Blue, 50% Splash
Black x Black = 100% Black
Splash x Splash = 100% Splash
Splash x Black = 100% Blue