These are phrases that many of use use unthinkingly , and whilst they aren’t directly racist in any way, they nevertheless reinforce the beliefs that white is positive/ black negative.
Oh, please, anyone who finds themselves thinking negatively of someone who doesn't have pinky/beige skin, only because we talk of blackmail, black market or dark forces. In fact has anyone ever done that and where is the evidence.
In fact no one has either white or black skin but something along a range between those two extremes. I assume we shouldn't talk about someone wearing a drab brown coat, or the wintry colours of brown.. Then of course there is yellow, oh horror of horrors, that too is racist, as is red, and think of all those aliens we describe as little green men.
In fact there is not a single colour that cannot be considered racist and demeaning of someone, oh except purple, but I'm working on it.
The earliest Brtains were dark skinned and blue eyed and there are still today ethinic groups with that colouring.
Black/white they are the names of colours. Take it to ridiculous limits and describing snow as white will be considered racist. Many of the terms