Hypercolor Thinking Putty is thermochromic -- just a touch from your hands will reveal a new "hot" color. Allow it to cool off or stick it in the fridge! Then the "cool" color will be restored.
Amethyst Blush Thinking Putty's soothing color will ease the user's nerves. With just a touch of warmth, the purple fades to reveal a surprising pink blush! Exciting and bright, this dynamic Thinking Putty is sure to perk up a student's day!