Checked Larry Trapps old KY reference book and he does not list a BLACK, he does indicate a DARK BLUE, along with a blue, yelo, white, & red.
I have two different shades of the white, an actual fairly white and an off shade which is more cream.
However in Jeff Laudermans book, "The Real Sin City", there is a BLACK listed along with the red, yelo, white, and blue.
Jeff must have seen the black at one time as he does have a pict in the book.