I was doing just that years ago, but the Fibromelanotic(black skin) breed was not silkie, but were Native American Stock, crossed with White Leghorns, but saddly I didnt get past the Back cross to Leghorn female
Dang if Only Silkies were good egg layers they would make for an Exceptional sexlink project, when crossed to just about any other breed with yellow shanks they make Sexlinks