Some links for the sake of interest
http://www.ansi.okstate.edu/poultry/chickens/ac/index.htm Ac chicken
http://www.feathersite.com/Poultry/CGP/Svart/BRKSvart.html Swedish Black Hen
http://www.feathersite.com/Poultry/CGA/Cemani/BRKCemani.html Ayam Cemani
Some other black skinned chicken breeds include the Swedish Black Hen and the Ac chicken of Vietnam. I am not aware if any of these exist in the US. The Sumatra has dark facial skin but the body skin is yellow. Sumatras would be useable in a breeding project for producing black skinned...