The color scheme
There are four colors in the English Setter. The lemon, the bluebelton, the tricolor and the liver.
The game of probabilities
It is difficult to predict with certainty the color of future puppies. JoeBlack might not wear tricolor genes, there is a high probability that it gives only bluebelton. Magie, born of a father lemon and a mother bluebelton, carry the lemon; the lemon is recessive. But, one thing is certain, currently the Blues Brothers are all black and white.