Answer:

inkier

AnswerCrossword Clue
INKIERComparatively black
INKIERHarder to see through, say
INKIERBlacker
INKIERDarker
INKIERMore shadowy
INKIERComparatively dark
INKIERMore dark
INKIERBlacker.
INKIERMore Stygian.
INKIERMore like printers' fingers
INKIERMore black
INKIERMore pitch-black
INKIERMore murky or shadowy
INKIERHarder to see in
INKIERMore like ocean depths
INKIERLike deeper ocean depths