(i) Black

(ii) Shachor (7838) - dusky, but also (absol.) jetty ; a primitive root [identical with 7836 through the idea of the duskiness of early dawn]; to be dim or dark (in color): a primitive root; properly, to dawn, i.e. (figuratively) be (up) early at any task (with the implication of earnestness); by extension, to search for (with painstaking).

(iii) Normally black represents sin (black, dark nature of sin). However, here it represents the quality of Jesus as the dawn - up early at the task of the Father.

(iv) (a) 5:11