How to Make Glue out of Milk: 14 Steps (with Pictures) - wikiHow
Society for Combat Archaeology - The shield boards and the leather are laminated using casein glue which has been produced based on a recipe from a 12th-century source (Theophilus). The water-resistant casein
casein Glue-Product-Casein Glue-Gansu Hua'an Biotechnology Group