In the TV-series Lucifer, Lucifer used to have wings and they are later revealed to be of bright white colour. But his brother had blackish wings. Is it due to his skin colour or is there any significance to it? Is there any explanation of it in comics or is it based on some Catholic beliefs?
It's because of Amenadiel being black, Uriel and Lucifer's wings are white as his skin too.
As you can see they are white:
And Uriel are white too, with a bit of brown but it can be shadows illusion:
We don't have proofs until now, so it's a big probability of being by skin colour. Perhaps, I have another suggestion that's because of Amenadiel being a warrior and Uriel and Lucifer don't.