Knowledge of glue
History of liquid glues
Polyvinyl alcohol, a synthetic resin that has been industrialized since the war, has been used. It became the market in 1975, and it has reached the present.
There was no liquid glues before that, and Arabia glues was used. This is a natural adhesive that melts the gum of the sap of the Acashiya into water. The Arabia glues dries quickly, and it is easy to handle, but because it is expensive, it is hardly used now.
The Arabian glues was used in a container with an aluminum cap attached to a green glass jar with a sponge-coated mouth. It is thought that it became a model of the liquid glues with the current urethane coating mouth.