This glue is equivalent to glue made from flour and water but without cooking.

Milk casein is an excellent glue for paper to itself or to glass and for wood.
With a paintbrush, coat the paper to glue and fix it to the other substrate (paper, cardboard or glass).

Egg white contains albumen which has a strong adhesive power. It was used for centuries as a binder in tempera, for book illumination and for gilding.

This method is derived from techniques still in use in Scandinavia.
Bark from other tree species can be used but the best properties are still obtained from birch.