It is yellow, or a swarthy yellow. All varieties of Cochins should have this color for the legs, shanks, and feet.I would love to know what the standard is on the leg/shank color in B/B/S bantams. Why did you ask did you ask about yellow showing through? I'm trying to read between the lines here and understand what possibilities you were considering when you asked. Thanks for any help with this issue.
~Casey