Mystic Glacier4 inch tinMystic Glacier is an icy blue swirled with glitter that instantly changes to a deep purple with sunlight. No sunlight available? Just use the enclosed blacklight keychain to create the amazing purple hue indoors. Then turn off the lights to reveal a green luminescent glow.Best played with under regular room lighting so you can see both the daytime and nighttime colors simultaneously! Hold the blacklight keychain close to the putty to draw a dark line, and move it farther away for a blurry line.What can you do with Phantoms Thinking Putty? The possibilities are endless!