I had to look up the parentage on that... it comes from a yellow ('Slender Lady') and a red black.
Pat Stamile once spoke at one of our local club meetings, some years ago. If I can recall correctly what he said, it was along the lines of some yellows having genes for mud, which weren't apparent in the yellows themselves, but which can make the offspring muddy.
I have been trying to set seeds on a (somewhat clear) red seedling of mine, crossed by either 'Hip to be Square' or 'Polly Wolly Doodle', both of which have 'Bill Norris' in the background. If I succeed, I am sure that the offspring is going to be muddy. If F1 is half mud (half the genes not from the red), then F2 would be quarter mud, F3 might conceivably see a return to clear colors, depending on the length of the crosses and what the parents in succeeding generations were. Trying to get the clear red color back while *also* keeping the polymerous trait (if any showed up in the F1), though....
