Anerythristic or anaxthic ????

[citrus]

how do you tell the difference between a anery or axanthic?
Anery, is a mutation that keeps the animal from producing erythrin, the red pigment and axanthic is an absence of yellow pigment.

as we dont have any anery carpet pythons in australia i have been looking at boas overseas and to me some of them look the same.... can anyone clear this up