You can't get BBS out of black...splash is a double copy of blue, and the blue gene is not recessive, so a black bird can not be a carrier....if a bird has the blue gene, it will be blue...or splash if a double copy....Of you have a blue or splash in the mix, yes, you can build a BBS flock.I bought some "purebred" Amerucanas only to find out when I get there that she didn't have her colors separated. She only had photos of blues and blacks online. I didn't know enough at the moment to know better and I left with a dozen chicks. 4 black, 4 Wheaton, 3 blue Wheaton, and one blue. She said that the rooster would have been either a blue or a Wheaton and I didn't ask about the hens. Everything that was said to be Wheaton or blue Wheaton looks EE. Out of the four blacks two appear to be Extended black. So my question is... without knowing what the color of the hens were is there a way to tell if any of my blacks could be pure? If I bred the extended they should produce b/b/s right? I have learned an important lesson here and next time I will refer to the list of ABC breeders. Thanks for any help.