My Pekin duck was a beautiful white until he molted, some of him has turned back to snow white, however mainly his body and neck is still a light buttery yellow color. He is being exhibited at a county fair on the 28th and don't know if his feather color will affect his placing. He was a late March/early April chick. Is there anything I could do or feed him to help him get back to white? Or am I stuck with a yellow ducky?