thank you!
I don't think the white is dominant as they have a bit reddish on the top of the few feathers. and they have yellow legs. I like black chickens so I will go for it! at the moment I have no barred chickens so it would be really good to have some.
No problem.

Actually that sounds probable dominant white as normally recessive white is totally white while dominant white leaks pretty easily.
This is because dominant white really works by repressing the black pigments and doesn't have much 'power' in repressing gold series pigments. Good examples of this are ISA Browns, various red sex link hens etc- those birds are in the Rhode island red color pattern, with the dominant white turning their black tails and necks white while only slightly diluting the red body.
So to make a solid white using dominant white, you need to make a solid black chicken... other unrelated genes are also often added to make sure the white stays clean white and/or to help with making the legs a clean yellow or white color. For example, barring also has the side effect of removing pigments from the legs, so it's often added to whites to both keep the white feathers AND the legs clear of pigments. Less common additions are mottle, blue, Bsd etc.
When you cross a black chicken with a colored chicken, it is very typical for the chicks to start out black but eventually show some color 'leaking'- black sex links are a great example.
Also common challenge is to keep the black chickens solid black... because there is not really a single gene that makes a chicken totally black. They usually have one of the main 'black chicken' genes plus additional genes to fill in the leaky areas with more black pigment. This is why the black chicken- colored chicken crosses normally show some 'other' color as they grow- they're missing or not pure for those 'helper genes'.
So it's possible your white bird showing some red is a mostly black chicken with some red leaking... dominant white would cover up all the black but since it is not so strong with the gold pigments the leaky red areas are showing through..
However, while normally recessives are solid white no matter what color they are over, very occasionally one will still show some leakage.
The only way to be 100% sure is to cross them and see what comes up..... that's part of fun with genetics....
