As I was reading about cwm for another thread. I came across this Strange and Unusual References site. It looks fun. They have a Dictionary of All-Consonant Words, and then one of All-Vowel Words, and they do a one-letter word-a-day. Today the word was K, and they write: "n. the color black, as in the acronym CMYK (cyan, magenta, yellow, and black).

<The letter K is used to designate black because the B is already in use for the color blue. —Taz Tally, SilverFast: The Official Guide.>"

I see they link to lots of sites, including OEDILF. Too bad they don't link to us.