Hope this helps! The second one is easiest. I know there is a longer version that can tell you comb types and how many toes type stuff from things that are crossed farther apart. But I think this is the simplest.
In my experience you'r basically gonna get black with some leakage.
If I were to breed a black Silkie cockerel with a Partridge Silkie Hen, What would their offspring look like? I think it should also be noted, that the black cockerel does have a considerable amount of brown leakage. Thank you