O have a couple pictures of Blaze crowing but don't think I can tell. Its not the right angle.
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Based on the quality of his copper, I wouldnt imagine him having white underfluff. I would be very surprised if he did. My birds with halos have white while the cockerels with deeper copper color dont. Or so far anyway. I checked SW (deep even copper) a month ago and he didnt have it then. Seems like I checked Dark Angel around the same time and he didnt have it either. He also has deep copper. I cant remember if I checked Vortex or not.