I've never bought birds from her.. she only sells roosters and I've already got 4 so no more for me!No no no! Run as fast as you can from that lady!
That is not unique, and they're is nothing purebred about it. She might be a nice person, but she is misleading people. I'll give her the benefit of the doubt, maybe she is uneducated on the need, or was simply mislead herself. That being said RUN!
A white toe nail or tongue is a cull, and rather common but can still be purebred. White feathers is a mutt though.
That's like saying a black and white Peking duck is purebred. I mean, it might look cool kinda like Patti and Shaw's (Fake Ellen) Cayugas, it may even be unique looking, but it's not purebred. With three Cayuga though, that is expected over time, but it should not be present in Ayam Cemanis.