As others have said, what you are proposing, wouldn't get you the results you truly are looking for.
All we need to look at are the two well known morphs dealing with an excess of yellow, or the limiting/lack of yellow (Pastel and Axanthic) and see that both have issues with animals aging and "Browning" out to show that the yellow pigment is not the issue when it comes to the browning out that happens.
The charcoal / black axanthics are a very neat line as well, but I think what we are seeing here is hypermelanism(Excess black pigment) combined with axanthicism (lacking yellow) to produce a very black and "white" animal.
Truth be told, what your best bet would be, as others have said would be to combine an axanthic line, with the fire (het lucy) trait. Fires and Vanillas have both been shown to stay "clean" as they age meaning the browns do not come in.
Another option would even be to throw in the pastel mutation as well to increase the yellow concentration, the axanthic mutation to wash out the yellow, and the fire/vanilla mutations (yes they are different, not same thing) to keep the animal "clean" into adulthood avoiding the browning out that is common with both axanthics and pastels. I don't necessarily think that axanthics or pastels cause the browning out, only that they make it more noticeable than the wild types maturing into their brown colors.
Hope that helps
Originally Posted by Mahlon
As others have said, what you are proposing, wouldn't get you the results you truly are looking for.
Reply With Quote