A lot of people house these three colors together because they all cross well. Here is the gene chart for BBS The way the Blue gene works in a breeding can be broken down as follows: 1) Blue x Blue: This will produce 25% black, 50% blue, 25% splash. 2) Black x Blue: Produces 50% black and 50% blue. 3) Black x Splash: You'll get 100% blue. 4) Blue x Splash: Produces 50% blue and 50% splash. 5) Splash x Splash: This will give you 100% Splash.