Krypton is a noble gas that prefers to stand on its own and rarely plays with others. When stimulated with electricity, this natural element glows brightly and reliably. From light sabers to kryptonite, Kryptons unique green spectra have inspired many pop culture and sci-fi favorites, including our own Krypton Thinking Putty! White by day, this putty glows the signature green in the dark. Each tin includes 1/5 lb of Krypton Thinking Puttya huge handful for tons of fun.