Blue's Clues Imagine Ink Activity Book. Reveal a rainbow of colors on every page with the Blue's Clues activity book using the Imagine Ink technology to magically reveals designs. Your little artist will love finding favorite Blue's Clues characters, and you'll love the magic of mess-free coloring! Includes book and marker7.75'' W x 10.75'' H x 0.688'' D16 pagesRecommended for ages 3 years and up.