To half a pint of milk put an equal quantity of vinegar in order to
curdle it; then separate the curd from the whey and mix the whey with
the whites of four or five eggs, beating the whole well together. When
it is well-mixed, add a little quick-lime, through a sieve, until it
has acquired the consistency of a thick paste. With this cement broken
vessels and cracks of all kinds may be mended. It dries quickly and
resists the action of fire and water.
Another: Into a thick solution of gum arabic, stir plaster of Paris
until the mixture assumes the consistency of cream; apply with a brush
to the broken edges of china and join together. In three days the
article cannot be broken in the same place. The whiteness of the
cement adds to its value.