Curing Comparison

Once the shirts (and other items) have been soaked and dyed they must sit for a while to let the colors stick, a process called curing. I intend to measure whether they need 2 hours, 8 hours, a day, 2 days, or more. I have a friend who insists that his shirts come out brighter if he leaves them in the sun or warms them in a cabinet he designed for that purpose, so I intend to test whether temperature is a factor as well.