loomaliimi

Loomaliimi, or animal glue, is a traditional adhesive made from collagen derived from animal by‑products such as hides and bones. It is produced by simmering these materials in water to extract the collagen, which is then dried into flakes or granules and later dissolved in hot water to form the glue.

When hot, loomaliimi is liquid enough to brush onto surfaces and, as it cools, it forms a bond that is relatively strong on porous materials like wood, paper, and leather. The bond is reversible with heat and moisture, making repairs feasible. It has limited water resistance and can soften or weaken in high temperatures, humidity, or moist environments.

Typical uses include woodworking joints, cabinetry, bookbinding, veneering, picture framing, and certain forms of instrument making and restoration. In conservation and some traditional crafts, loomaliimi is valued for its reversibility and natural composition.

Variants and storage: There are different formulations based on the source of collagen (eg, hides vs bones). In practice, hobbyists and conservators may distinguish between hot-hide glue and other preparations, including “cold” formulations used for specific applications. The solid material should be stored in a dry, airtight container; it has a long shelf life when kept dry and can be re-dissolved by reheating as needed.

Alternatives: Modern synthetic adhesives such as PVA (polyvinyl acetate) and epoxy offer greater water resistance and strength. Loomaliimi remains favored when reversibility, archival compatibility, or traditional aesthetics are important, such as in bookbinding, instrument making, and conservation.