Amber is tree sap that’s been fossilized over eons. Oftentimes this fossilized resin includes insects such as ancient ants flies or mosquitoes that lived millions of years ago. The allure of amber has to do with its timelessness but also its pretty glow which is attributable to the stone’s phosphorescent properties. Just like the rare white version of the precious stone Amber Thinking Putty starts out white and glows the classic amber-gold hue in the dark.