The unique disappearing purple formula helps kids see exactly where the glue is applied and then dries clear. Ideal for school projects and home crafts, Elmer's Disappearing Purple Liquid School Glue works on all kinds of materials such as paper, display board, cardboard, foam board, photos, and much more. Like all Elmer’s School Glues, Disappearing Purple Liquid School Glue is formulated to be non-toxic and washable to create a worry-free, creative crafting experience.