My new Black and White Ancona has that blue-green sheen too. However, today I noticed that his tail has some white, some black and it looks like one or two brown feathers. I feel so frustrated trying to learn what I brought home a couple of weeks ago. The other one has the penciled (or laced) brown and black feathers. I suspect that neither of these birds will turn out to be to standard, but they are delightful creatures and they are adapting to a much better living condition than they had before. So now I launch into learning everything I can about the breed hoping that next spring I can start with a few top quality birds.