Invisible Ink Activity Book Set for Kids Toddlers - 2 Travel Activity Books Bundle Featuring Toy Story and Inside Out with Invisible Ink Pen and More. These officially licensed Invisible Ink activity books for kids and toddlers reveal hidden games and pictures with favorite characters from Toy Story and Inside Out. Set includes 1 Inside Out coloring book with stickers and 2 mess-free imagine ink coloring books featuring Toy Story and Inside Out with magic invisible ink pen that will not visibly mark most other items or surfaces. Also includes bonus Toy Story stickers. These invisible ink coloring books for kids are a modern update to color with water books and paint with water books for toddlers and kids. These magical hidden picture books for children are perfect as travel activities for kids, party supplies and party favors. Officially licensed Toy Story and Inside Out coloring and activity books.