There are those who theorize that to consistently produce blacks with good yellow legs on both sexes that a system of double mating must be used. It is possible to get yellow legged males using E (extended black) at the e-locus, while yellow legged females must have e>b (brown) at the e locus with certain necessary color enhancing genes. The e>b black males will often have off-colored feathers, so are not suitable for showing, while E females almost invariably have that pesky black on the legs. We did some limited experimentation with this theory using Black Wyandotte bantams (E based) and Silver Laced Wyandotte bantams (e>b based). In limited testing a couple of female blacks with decent yellow legs were produced, one of which won a BV in good competition. That was some years ago, and we gave up the blacks because we didn't want to continue with double mating.