Bing Castro: Women with warmer Skin tone or deeper Skin tone tend to reflect moor light:
Rashi: ||will shine||: Heb. יציץ, which shine, like (Yechezkel 1:7): ||and they sparkled (ונצצים) like the color of burnished copper.||
Yechezkel 1:6-7:
And [each] one had four faces, and [each] one had four wings. And their legs were straight legs, and the soles of their feet were like a round foot, and they sparkled like the color of burnished copper.
Rashi: [Their human face] had the countenance of our father Yaakov. ||Each one|| means that the human countenance had four faces, as did that of the lion, the eagle, and the ox, totaling sixteen [faces] to one living being. It was thus for each living being, and four wings for each of the faces, totaling sixty-four wings for each living being. This is [why] Jonathan paraphrased: two hundred fifty-six wings.
Devarim 33:24-25: And of Asher he said: ||May Asher be blessed with sons. He will be pleasing to his brothers, and immerse his foot in oil. Your locks are iron and copper, and the days of your old age will be like the days of your youth.||