In 1935 T S Bowman of Carlisle bred a Skyblue Slate and a Cobalt Slate, both hens, from a Cobalt cock and a Skyblue hen.
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W H James, of Flixton, near Manchester, was one of the first to cross-breed Violets and Slates, attempting it first in 1955, and Cyril Rogers also investigated the effect of combining several darkening mutations in one bird in the late 1950s and early 1960s.
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