The term “black” in the scriptures refers to the presence of pride, egoism, or sin. This is a male (selfish) and fallen presence. When the scriptures refer to dark skin in a negative way, it refers to someone or a people that once had the light of God, the Shekinah, but lost this light. As modern readers we should remember that the people of both the Bible and the Book of Mormon had literal dark skin.
See 1 Moses 7:13; 27:23; Alma 1:103-104 RAV, 3:5-6 OPV;