Printing on the reverse side or underside of a sheet or transparent film, to create a text continuation or, in the case of transparent films, to provide a background for the text or other design printed on the front side. Back printing is completed with head-to-head imposition (the top of the copy on the back side is the same as that on the front side, as the pages of a book), head-to-foot imposition (the top of the copy on the back side begins at what is the foot of the copy on the front side), or head-to-side (the copy on the reverse side is at a right angle to the copy on the front side). It is also known as reverse printing. See also Face Printing.