Toy / Game Thinking Putty - Glow-In-The-Dark - 4 Inch - Aura - You Can Even Do Cool Tricks & Glow For Hours Milky white in daylight, their glow magically appears when the lights dim. It's translucent -- so the glow appears to come from deep within! Use our Blacklight Keychain to write messages on the putty and draw special designs! Make your own shadow photographs! Tear it in darkness and watch it spark! Each tin contains 1/5lb of Thinking Putty.