Asian blau. Called blue cheat. It is a dominant gene, which is pretty interesting. In heterozygotous state it lowers synthesis of red erythrophores and probably in much lower level also yellow xantophores. It also slightly modifies guanine presence. In homozygotous state effect is much more visible as it almost completly removes red erythrophores and yellow xantophores leaving deeper layers (guanophores and melanophores) more visible. So even if it also lowers guanine levels in homozygotous state it usually shows blue shine (however the effect is based on the genotype).
On example above we can clearly see that this male shows full synthesis of all colors. We have guanine, melanine, xantophores and erythrophores.
On the above male (brother of first one) red is present in a genotype – it is masked tho by asian blau in heterozygotous form. It means that we have not removed the red from the genotype and during the outcross or in future breedings it will still be visible within genotype. That is why asian blau is called a cheat – it is not actually removing a red coloration from the line.
In above male we have asian blau in homozygotous state. It has removed yellow (metal gold is partially affected) and totally removed red which makes refletive quantities of deeper layers of guanine more prominent.
All three above males came from one line. Genetically they are grey body Schimmelpfennig platinum with red tail and some snakeskin variegation. The resulting phenotype is an effect of asian blau gene which modifies yellow xantophores, red erythrophores and reflective quanophores.