Crazy Aaron’s Thinking Putty - Hypercolor Night Fall Bright coloured putty AU$5.95 Out of stock. Trick | Hypercolor Thinking Putty 2" tin by Crazy Aarons Night Fall is a heat sensitive hypercolour. It changes from purple to blue. Only available in the mini tins. For Ages 3 and up - Made in the USA of non-toxic silicone, never dries out & is easily removed from solid surfaces - Gluten free, latex free and amazing for special needs, party favors & much more!