Frosty vs. Faded
The eight (8) photos on this page came from Tim Kvidera of Anoka, Minnesota. Of particular interest is the comparison(s) of the Frosty plumage and the Faded plumage. The frosty blue check hen's plumage appears to be unaffected by the presence of the frosty gene (hemizygous). Frosty is thought to be sex-linked (and possibly(?) a recessive gene). If so, it seems to be unique in that it does not express itself, to a significant degree, in hens - as do other recessive (or dominant) sex-linked genes.
Tim Kvidera's loft in the picture at the bottom of the page must be the envy of every pigeon fancier. Thanks Tim, for the photos.