[Labyrinthos]

So even the Washington Times, a conservative paper, is now capitalizing "black."

Grammatically its a close call because proper adjectives (adjectives that describe a proper noun) are generally capitalized.

[Fiji Hill]

If they capitalize “black,” they should capitalize “white,” but many publications today only capitalize “black.” Previously, “black” and “white” were lower-case while “Negro” and “Caucasian” were capitalized.