In the ‘70s, it was mood rings. In the ‘80s, clothing. Want to get your hands on a timeless thermochromic product? Try our Hypercolor Thinking Putty! This groovy putty changes color with just the heat of your hands. The awesome effect makes it perfect for twists, duo-toned sculptures, 5-minute breaks, and other timeouts. Put it in the fridge then against a warm coffee mug to experience an even more intense color change. Crazy Aarons heat sensitive thinking putty has the amazing ability to change colour. You can tear, knead, twist, bounce, sculpt and stretch Crazy Aarons Thinking Putty. With so many play options children will be amazed at the brilliant ideas they create with a handful of putty. These tins includes 95ml of Thinking Putty.