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1Pack of Changing Heat Sensitive Lab Putty Thinking Crazy. Apply Heat and see how the color changes.Thinking Crazy Lab Putty. Super-malleable Transparent Bouncing and squishy putty puddy packed with Lots of Fun. Assorted Colors Orange, Purple and Blue. Make your Smart Lab Putty Game Toy portable and long lasting with a Tin Case included. Great Sensory Experiential Learning Toy. Prime, Tactile Game, Quiet Toys, Physical Occupational Therapy, Vacation.