Properly the absence of all colour. In Proverbs 7:9 the Hebrew word means, as in the margin of the Revised Version, "the pupil of the eye." It is translated "apple" of the eye in Deuteronomy 32:10; Psalms 17:8; Proverbs 7:2. It is a different word which is rendered "black" in Leviticus 13:31,37; Cant 1:5; 5:11; and Zechariah 6:2,6. It is uncertain what the "black marble" of Esther 1:6 was which formed a part of the mosaic pavement.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Black'". "Easton's Bible Dictionary".