filling in
1. The operation of pasting heavy paper to the
insides of the boards of a book within the
turn-ins of the covering material. The purpose of
filling in is to prevent the thickness of the
turn-ins from being noticeable under the board
papers. Filling in is done only in craft
bookbinding. 2. A fault in blocking, printing,
etc., in which the spaces in types, or the spaces
between the dots of a halftone block, fill with
gold, coloring, or ink. In blocking it may be
caused by worn or damaged type, or by a type
holder that is too hot; in printing, it may be
caused by too much ink, or an ink that is
unsuitable for the job, by the form being too
high, the rollers being set incorrectly, or by the
use of an unsuitable paper, especially one which
fluffs. (92 , 156 , 161 , 335 )
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