Glow in the Dark Thinking Putty is hypnotic and irresistible! Milky white in daylight, their glow magically appears when the lights dim. You can use our Blacklight Keychain to write messages on the putty and draw special designs. You can even do cool tricks with Glow in the Dark Thinking Putty. After exposure to light (the brighter, the better), these colors will glow for hours. Made in the USA. Each metal tin is hand packed with 1/5 lb of Thinking Putty, much more than you get in a plastic egg! Amber Thinking Putty's exotic jack-o-lantern glow is simply awesome! Use with our Blacklight Keychain for a glow visible in a lit room! After about an hour, the magic fades...until next time!