Note:  Do not rely on this information. It is very old.

Wafers

Wafers, thin brittle discs of dried paste, usually made of flour and water, which, in the case of coloured wafers, are mixed with the non-poisonous colouring matter. They were formerly used as a ground on which to stamp seals, but the purpose to which they are now chiefly put is that of fastening papers together.