Oh leakage....forgot about that. I'm not a genetics wizard so someone more knowledgeable please correct anything if I'm mistaken.
Black Coppers are gold based.
Black Silvers are silver based.
These colors don't play well together in breeding.
By mating a gold based roo to a Silver based hen (this example Black Copper roo x Black Silver hen). All females will be Black Coppers coming from Kong, the males will be Copper but have Silver leakage. (Looks like dirty dish water)
Here's a accidental visual...
Had a chick hatch accidentally from King (Black Copper- gold based) and a Silver Laced Wyandotte (silver based)
You can see the copper mixed in with the silver in this male. Dirty look.
View attachment 4046944
Cull means to remove from the flock. (kill, eat, sell, re-home). I sell all my culls.