Actually most of your corns... will gain yellow as they get older... my baby snow started out very pink... now if you put him in the light all his saddles are surronded by yellow rings... it looks very nice!!! the high yellow will become more and more brillant... trust me you want your snow to gain more yellow... especially on the nose!!! but this is normal... all corns unless they lack the yellow pigment will gain more and more yellow with each shed!