The Ultimate Invisible Ink Activity Book By Klutz Press

This unique book is jam-packed with hidden messages, secret codes, games, jokes, and more, perfect for busting even the most unbeatable boredom. You'll see both visible (and invisible) activities, fabulous facts, and mysterious messages throughout the pages. Includes one UV pen to uncover invisible ink, plus write and reveal your own hidden messages. 64 pages. For ages 6 and up.