Reflected light should show extreme iridescence, preferably green, all over the dark parts of the bird. The ocher-colored underbody parts should also show extreme iridescence, preferably reddish. Iridescence should not be confined simply to the edge of each feather but should form a band spreading into the feather. This band should begin at the tip and continue up to where the feather is covered by other feathers. The more mirror-like the plumage, the better.
Birds having grease-quills are to be preferred.
Eye color other than yellow. Light colored or faded out back or rump. Brownish or bronze color on black of head or upper body. Any color other than ocher showing in base color of visible underbody feathers, except for legging effect. 13-15 tail feathers.