Chalk is a naturally occurring rock, which was formed by the deposition of smallest marine organisms about 70 million years ago.
Glue is obtained from animal tissue, especially skin and bones. These can be filtered by boiling.
The carrier of these substances is the protein collagen, which transforms into water-soluble protein glue by heat exposure. The glutin causes the sticking and binding power of the glue. This process is the case in all glues produced from animal tissue, therfore skin, bone and fish glues are also called gluten glue.