The word(s) "dark" appears 31 time(s) in 29 verse(s) in Quran in Muhammad Habib Shakir translation.

(11) And (as for) those who have earned evil, the punishment of an evil is the like of it, and abasement shall come upon them-- they shall have none to protect them from Allah-- as if their faces had been covered with slices of the dense darkness of night; these are the inmates of the fire; in it they shall abide.

(12) Say: Who is the Lord of the heavens and the earth?-- Say: Allah. Say: Do you take then besides Him guardians who do not control any profit or harm for themselves? Say: Are the blind and the seeing alike? Or can the darkness and the light be equal? Or have they set up with Allah associates who have created creation like His, so that what is created became confused to them? Say: Allah is the Creator of all things, and He is the One, the Supreme.

(13) Alif Lam Ra. (This is) a Book which We have revealed to you that you may bring forth men, by their Lord's permission from utter darkness into light-- to the way of the Mighty, the Praised One,

(14) And certainly We sent Musa with Our communications, saying: Bring forth your people from utter darkness into light and remind them of the days of Allah; most surely there are signs in this for every patient, grateful one.

(15) Keep up prayer from the declining of the sun till the darkness of the night and the morning recitation; surely the morning recitation is witnessed.

(16) Or like utter darkness in the deep sea: there covers it a wave above which is another wave, above which is a cloud, (layers of) utter darkness one above another; when he holds out his hand, he is almost unable to see it; and to whomsoever Allah does not give light, he has no light.

(17) Or, Who guides you in utter darkness of the land and the sea, and Who sends the winds as good news before His mercy. Is there a god with Allah? Exalted by Allah above what they associate (with Him).

(18) He it is Who sends His blessings on you, and (so do) His angels, that He may bring you forth out of utter darkness into the light; and He is Merciful to the believers.

(19) Nor the darkness and the light,

(20) And a sign to them is the night: We draw forth from it the day, then lo! they are in the dark;