If you look at the picture of the cockerel on cemani farms' Live Stock page, a farm that is in Indonesia (and is probably where these birds were illegally imported from since they will ship anywhere in the world with no permits) you can clearly see he has a green sheen in his tail and throughout his body. That's a bird in Indonesia from an Indonesian breeder. So
Yep, that's like what I had seen before... but before I got to that pic, I noticed the pic on their homepage...
I can see no obvious differences between that broody hen and the 2 I have sitting out in my own coop... save one... she obviously has a bad case of feather lice... if that's the look that is supposed to be 'pure', I think I'll pass and be quite content with our available stock...