is an autosomal recessive gene, this mutation does not affect the pigmentation of melanin, but instead removes all psittacin pigmentation converting yellow, orange and red pigments to white. This mutation is known as blue in other parrots.
Creamface is an autotomal recessive mutation which behaves co-dominantly towards the whiteface gene, this mutation is an allele of the Whiteface mutation meaning that this mutation moves on the same set of X chromosomes and rest on the same loci.
This origins of this mutation is unknown, it was available in South Africa in the early 1990’s where the first breeders to reproduce this mutation referred to this as phenomena as cream.
Creamface in theory removes 75% of psittacin pigmentation throughout the plumage, but if this were true there would be an even yellow tone reduced to 75% throughout the plumage which does not seem to be the case, where as it seems that the psittacin is removed throughout the body all except for the face where it seems to be reduced.
also an allele of Whiteface as well as Creamface gene meaning that they all move on the same set of X chromosomes and rest on the same loci. Paleface and creamface behave co-dominantly towards the Whiteface gene, but when pairing Paleface to Creamface the Creamface gene behaves recessive towards Paleface, meaning that a Paleface bird can carry a Creamface gene with no visual difference ,but not vice versa.