Fish glue

Fish glue, also known as fish gelatin or isinglass, is a type of adhesive or binder that is derived from the swim bladders of certain species of fish. It has been used for centuries as a natural adhesive in various applications, including woodworking, bookbinding, gilding, and the restoration of artworks.

Here are some key aspects of fish glue:

  1. Source: Fish glue is made from the collagen-rich swim bladders of fish, primarily sturgeon, cod, or hake. The swim bladders are harvested, cleaned, and processed to extract the collagen protein.

  2. Adhesive Properties: Fish glue is a protein-based adhesive that forms a strong bond when applied to surfaces. It has excellent adhesion properties, particularly for porous materials such as wood, paper, and fabric.

  3. Natural and Organic: Fish glue is a natural and organic adhesive, making it a desirable choice for artists, conservators, and craftsmen who prefer using environmentally friendly materials. It is free from synthetic additives or chemicals.

  4. Water-Soluble: Fish glue is water-soluble, which means it can be easily dissolved in water to create a liquid adhesive. This characteristic makes it convenient to work with and allows for easy clean-up and reversibility.

  5. Application: Fish glue can be applied using various methods, such as brush application, spray application, or by heating the glue to liquid form for specific uses. It is often used in woodworking to bond joints, veneers, or in marquetry. It is also commonly used in bookbinding for attaching book spines, covers, or repairing pages.

  6. Strength and Flexibility: Fish glue provides a strong bond and has good flexibility, allowing it to withstand the natural movements and stresses that may occur in materials over time.

  7. Conservation and Restoration: Due to its reversible nature and compatibility with historic materials, fish glue is often used in the conservation and restoration of artworks, antique furniture, and other delicate objects. Its compatibility and reversibility make it a preferred choice to ensure minimal damage during restoration processes.

  8. Alternative to Animal-Based Glues: Fish glue is considered a viable alternative to other animal-based glues, such as rabbit skin glue or hide glue, for those who prefer to use adhesive materials from sustainable fish sources.

Fish glue has a long history of use in traditional craftsmanship and conservation practices. Its unique properties make it a valuable adhesive for artists and artisans who seek natural, water-soluble, and reversible options for their projects.