With rare exceptions, endpapers are not part of the book as printed. They are the double leaves added at front and back by the binder, the outer leaf of each being pasted to the inner surface of the cover (known as the paste-down), the inner leaves (or free endpapers) forming the ﬁrst and last of the volume when bound or cased.
Strictly speaking, this term means a binder’s blankadditional to, and following, the free front endpaperor preceding the rear. It is, however, often used of the free front endpaper itself.
In a leather-bound book it is necessary to distinguish these printer’s
blanks (sometimes signalised by cataloguers as ‘blank and genuine’)
from any extra leaves which the binder may have used in the front or
back – conveniently called binder’s blanks.