How does gelatin differ from animal glue?

Both gelatin and animal glue are derived from collagen, the primary protein found in animal skin, bone, and muscle. The distinction between the two lies primarily in the purity and the processing method used to extract the protein.12

• Gelatin: This is a high-molecular-weight product obtained through a mild conversion process using pure protein. Because of its high purity, it is suitable for use in food products, pharmaceuticals, and photographic materials.12
• Animal glue: This material is produced through more vigorous processing, which results in a lower-molecular-weight product. It is typically less pure and darker in color than gelatin. Due to its high initial tack, it has traditionally been used for industrial applications such as wood joining, bookbinding, and the manufacture of sandpaper.13

While both substances share the ability to form gels, their differing levels of refinement dictate whether they are used for human consumption or as industrial adhesives.12