Hi Jeff,
I have NJ babies that hatch out with a great deal of red and yellow and I get the black and white ones in the same clutch. Actually, the ones with red/yellow usually fade to white by their second year anyway. I guess you are right in that there may be some yellow that is present, but it is just so faint that I can't pick it out, or it concealed by the contrasting black.
Regardless, many of these kings (in my collection anyway) do not have any visible yellow in adulthood and I often describe them as having an anyer/axanthic appearance (which I believe that they have). They certainly have far less yellow/orange in adulthood than the recognized anyerthristic (sp?) corns or axanthic ball pythons, unrecognizable amounts actually.
I'm not trying to start a morph or mutation debate, I'm just calling them as I see 'em. The snakes that I'm refering to have no visible yellow, I describe them with the term that most fits. It is clearly not the same as the anyer/axanthic recessive mutiations common these days in herpetoculture, but then again, these terms weren't coined specifically to describe the color of reptiles, that is just the context in which reptile keepers understand them.
Will