They look young to tell yet, and I'm not sure that they are polish or silkies. Where did you find them? I am thinking they may be brabanters, here is the link to feathersite they look alot alike.
Some of the others i got from him look like that.Thanks alot. He told me first they were full blooded polish. Then i go back and the story is differant.I am new at this and well all i can say he wasnt honest .But when i went back he tells me there mixed .So my kids wanted more and so the hens i got they were still fertile and thats were they came from.He had a polish roo in there . But that dont mean any thing Thank alot