This is what I know from my nearly 10 years experience with Pieds, het Pieds, and combos. Animals from my line have reliable markers to indicate they are het Pied. Those of you that say there is no reliable het Pied marker must not have much experience producing them or their combos. If you would like to see pictures, I would be happy to post dozens of them.
As for het Axanthic markers, I can only comment on the VPI line.....and yes there are indications of hets at least when combined with Pastel and Spider, and even more so with Bumble Bees. This was discovered very early on by some of the bigger guys when the first Pastels and Bees het Axanthic were produced. I have seen it first hand in my own collection the last two seasons. With Pastel, Spider, and Bee het axanthics you have a reduction of yellow giving the animals an overall lighter appearance at hatching.
I really don't care if it is recessive or co-dom, but it's getting a little redundant of some people discrediting the het markers, especially the het Pieds, when there are countless small and LARGE breeders that have proven them over and over......Pete Kahl being the first to notice and he held all of his possible hets back while selling all of his 100% hets. He is the true king of Pieds for those that don't know.