More viscous than hide or bone glue. High yield, very elastic. Light yellow glue line. Glues of animal origin are simple to use, resist aging and can be softened again by heating, which makes them very useful for repairs. In contrast to synthetic glues, they can be overpainted and stained. Also suitable as priming for painting and gilding. Cold water is added to the glue, which is left to soak. It is then carefully heated in a water bath. Do not alow to boil.