Black skin? Are you talking about feathers? Because if you are I think you need to do a lot more research before even considering getting a duck.
I'm not sure there is a duck with black skin. In the traditional domesticated types, there is not, that I am aware of.
I know Cayugas have black feet, feathers and bills, but their skin is white.
Do you know of any off the top of your head that are darker than white?
Thanks everyone for your input so far. Hopefully, I can find some ducks with darker colored skin and go from there.
Maybe Black East Indies? They seem to be darker than Cayungas. Are you wanting skin like those chickens (I saw on Iron Chef one time) where the meat was black, the comb was black, everything was black. That would be interesting. Hope you can find some.