Our Magic Rainbow Book is a mess-free coloring book for kids. It uses a water-filled pen to reveal the colors within the pages of the coloring book. After finishing your masterpiece, let the pages dry, and then you’re ready to color again! It’s endless, mess-free fun!FEATURES:Children’s coloring bookUses a refillable water-filled markerReveals hidden colors in pages4 fun coloring pagesMess-freeReusable (pages can be re-colored once dry)