I like a sheen also but as far as breed standards for the cemani I would go with the mat black feathers just because that's how they are from their origin or ancestral lines
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silkies do not have much sheen to their feathers
you can import the Asian birds but you have to pay 4 import permit your tariff tax get your duty form ect... its all very complicated ,expensive and easier if you get a broker, many forms to fill out. at least that's what I was told in california
Silkies don't have normal feathers. But, even so, my black silkie rooster still has sheen on his one tail feather that has some barbules and is the closest feather he has to a normal feather. He also has some on his chest. I really would like to see a picture of the cemani without the sheen in full sunlight because I bet it's really neat to see. Not something you see a lot of, for sure.
There was an import embargo, that I think was rescinded very recently, but anything that came in before it was lifted was illegal, and it may still be illegal to bring anything in from Indonesia, I'm not sure what current laws are, but anyone who was bringing them into the country was doing so illegally until the ban was lifted.
http://www.cdc.gov/flu/avian/outbreaks/embargo.htm