From the Crazy Aaron's site:
Cryptography is an ancient art that’s been used throughout the ages to create secret messages. Nowadays, it’s mostly used for digital password and security encryptions, but Cryptic Code Thinking Putty® brings back the mystery. The included Glow Charger® turns the bright orange putty to a deep purple which quickly fades away—making it perfect for covert communications of all kinds.
PRODUCT DESCRIPTION
Collection: GHOSTWRITERS™| Color: Black with Multi-Colored Glitter | Glow: Red/Blue/Green Cosmic Glow™ | Includes Glow Charger® | Texture: Soft
Made in the USA from nontoxic silicone and never dries out
Stretch it, bounce it, pop it, tear it, and sculpt it! Fun for ages 8+
Includes 1/5 lb. (3.2 oz) of Genuine Crazy Aaron’s Thinking Putty
Thinking Putty is manufactured with the help of exceptional individuals challenged with disabilities
Note: 4" Tin