I sure don't know, and was also totally lost when you were asking me about me melanistic [sp?] genes at play to get me that black cockerel. As I told you about that beautiful, bright white EE pullet I have; she was produced by a Silver Ameraucana over a red sex-link hen. Absolutely looks to me to be very nice White Ameraucana, but I'm certainly not going to sell her as one. My best guess, after recently looking up red sex-link genetics again, is that she has dominant white from mom and silver from dad.
I think that the best solid blacks are E/E [extended black], and if also Ml/Ml [melonic], they are not supposed to able to show bleed. When making white split Ameraucanas, I had both blacks and blues bleed red or silver on their heads or necks on the males, a gold duckwing male, and one hen that looked like a red wheaten.[edited to add that the splits were from a White Ameraucana over bkack, blue, and splash Ameraucanas, and it was a black cockerel that leaked silver, the blue one leaked red] I don't know nearly enough to even begin to figure out where all those colors came from. Now that I think about it, the red wheaten [culled recently] was penned in my WC breeding pen, and almost has to be the mother of that white,muffed pullet with yellow legs that you tried to take. [lol, joking about you trying to take her] I was wanting to get a clean colored white pullet with muffs off the cross, but until just now had figured she must be from an EE because of her yellow legs. She's too young to lay, but now in my project pen because I like her Cornish shaped body.