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Well, the ducks we had at the winery were definitely Cayuga Blues and they never layed black eggs...the closest would be a light grayish blue. Maybe it had to do with their diet?
I used to work a a winery that would keep Cayuga Blue ducks. Their eggs are bluish and the ducks are beautiful
http://www.feathersite.com/Poultry/Ducks/Cayuga/BRKCayuga.html