Today I have had to prepare gelatine adhesive to work on one of the book I am doing conservation work on. I had been talking to my colleagues Tony and Jenny, and looking through their notes, they managed to give me Christopher Clarkson’s recommended method of making gelatine adhesive. He ran a course here in the studio in November 2010 about limp vellum bindings.
His suggested method was to use leaf gelatine which you can cut to different sizes and use different dosages of water to obtain the desired strength.
For a medium strength: