Elmer's Glue is made from synthesized chemicals that were originally found in raw materials that occur in nature, such as natural gas, petroleum and other raw materials. The exact formula for Elmer's Glue is not available to the public, as it is considered proprietary information.
Elmer's Glues, like most glues, contain polymers that sticky or tacky to allow the glue to bond items together. It also contains water, which dries out when exposed to air for periods of time. This is why glue is liquid in the bottle but hardens when left open or is squeezed out onto paper or another surface.
Some glues are made from the connective tissue of animals, particularly horses. However, Elmer's Glues are only made from man-made ingredients and are safe for use by people with milk allergies.
Elmer's School Glue, the white type used by children for arts and crafts projects, can be removed from surfaces by applying warm water or a cloth soaked in warm water. However, this method does not work for removing glue from clothing. To get the glue out of fabric, soak the material in room temperature water for 24 hours or more to soften the glue, then it can be washed as normal and air-dried.