If a bit of rather poor, lean cheese is soaked in water, and crumbled up and ground with lime and a little water, it makes a sticky, treacly mixture which dries as hard as stone and which, when it is once dry, is not affected by moisture. (Very much the same sort of glue is used now for putting together the wooden parts of aeroplanes.) Among the many troubles which beset medieval paintings in our time, one of the rarest is for the glued joints of the wood to separate; and their strength is largely due to the use of this strange, homely adhesive.

— The Materials and Techniques of Medieval Painting by Daniel V. Thompson (Page 31)