There is no certainty concerning the birth of this mutations, probably with the Personatus and by transmutations tranmited with the fischeris. We obtain this mutations because there is 50%  more black melanine, that gives us a blue one clearer.

The general color with the fischeri of the green serie,  green yellow east and the pennes are gray clear towards white. The mask must have the same color such as the wild type.

The inhéritance is autosomal recessive.