Solution:The term 'Chiaroscuro' originated during the Renaissance as drawing on coloured paper but in literature Chiaroscuro is the use of strong contrast between light and dark, usually bold contrast affecting the whole composition. So the lines-
"I have looked at it so long I think it is part of my heart. But it flickers. Faces and darkness separate us over and over A woman bends over me, |Searching my reaches for what she really is Then she turns to those liars, the candles or the moon. I see her back, and reflect if faithfully" are best example of Chiaroscuro artistic technique.