Girl's Only! Secret Message Lab
This box of intrigue is code for “This is so cool!” Enough materials for two girls to create secret codes and messages, to learn the science behind making invisible ink, and to reveal mysterious messages using colored filters and light waves. In all, 25 ways to share and protect secrets! The colorful 24-pg. book provides history and science lessons and full instructions. From International Playthings LLC, for ages 8-12 yrs.