Scarlet Letter Question?

My cl is currently reading "The Scarlet Letter" and we have this gigantic packet that is due on Monday. I have been working on it and the project igned with it. I have one question that me and my friends(we are having a mondo study sessh!) can figure out. If someone could help us out that would be really awesome. The question is: "Look for patterns of color imagery throughout the novel . Examine shades of light and darkness. These contrasts project and sometimes explain(or contradict) the cirstances. Look for one example and discuss it. Provide the page number where you found the information." I know its long but we are spent and any help would help.