I read that to be in relation to the devil who is supposedly evil and its association with the colour black.

I'd agree with that. Traditionally the Devil was portrayed as black rather than red - as I remember there's a character in Jane Austen who mentions "the black gentleman" (meaning Old Nick), which gave me pause when I first saw it.

Next you'll be stopping the black country being called the black country.

Yawn. It would be really useful if commenters could stick to what people actually are doing and saying.