How to euphemistically say that a person is black?

If you want to euphemistically express a person's dark thoughts, you can tell the other person that you are the kind of person who can blend into the night. If you shine me on the internet, I won't see you!

You can also tell each other euphemistically, have you worn less sunscreen recently or at ordinary times? Or are you wearing less sun protection clothes? Everyone else is fooling others. Why don't you do anything? I turned myself into this color.

So it is a euphemism to say that a person is black. You can use other words to hint at each other.