A black roo on silver laced hens will gove you a sexlink. The males will be patterned and the females will be black, and maybe alittle white. If you do it the other way, a silver laced roo on black hens, keep a male from that and cross it to a SL hen. Or you could just buy some from mcmurray or some one else.
How about breeding two silver laced cochins to get a silver laced cochin? The variety is in such a poor state of quality as it is, outcrossing is not the answer.