She looks very Brahma, but obviously not full.
So, knowing exactly what she has in her is not going to be easy, especially if she's a multigenerational mixed breed.
Results of crossing black Silkie X Mille Fleur D'uccle. This cross is for a Black Silkie rooster not pure for black.Same cross, but this time rooster is pure for black.
What white birds do you have, that could be possible mothers?
Genetics is one thing, I love. Also love learning it, & teaching others.
Black over gold produces either solid blacks, or blacks with leakage like you described.
You're welcome.
I've got 2 blue partridge EE hens, 1 Fibro EE hen, 1 Multicolored EE rooster, 1 Columbian EE Cockerel(Culling him), & 1 Black Ameraucana Hen.
There's Sapphire Bluebar, Blue Eggers. But I don't know much about them.
Sapphire Olive Eggers also have barring, but not all the time. Half of them do.