Easy to apply. Paper; Fabric; Photo safe. Glue stick is strong, fast bonding and safe for children. Purple is easy to see when applied, but dries clear and unnoticeable. No mess. Cleans off hands and household surfaces with soap and water. Can't leak. Great for papers and photos. Also good for fabrics. Acid free (pH above 7.0). Photo safe. Non toxic. Cap size meets regulations to reduce choking hazard in children under 3. Non toxic and cap size regulations are defined in the Federal Hazardous Substances Act. Conforms to ASTM D-4236.