Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/171

Rh finishing press to keep it steady, or it will shake and throw the fillet off. If a roll is used, take the gold up on the roll, but grease it first a little, by rubbing the gold rag over the edge to make the gold adhere. Then run the roll along the edge of the boards: the roll generally used for this purpose is called a bar roll—that is, one having a series of lines running at right angles with the edge of the roll.

Imitation morocco is generally used for publishers' bindings, where books are in large numbers and small in price, and the finishing is all done with the blocking press; To finish this leather by hand, it is advisable to wash it with paste-water and glaire twice.

Roan is generally used for circulating library work, and is very seldom finished with more than a few lines and the title across the back. This leather is prepared with paste-wash and glaire, and, when complete, varnished over the whole surface.

Inlaid Work.—Inlaid, or mosaic work, is used only in the higher branches of bookbinding. Formerly books were not inlaid, but painted with various colours. Grolier used a great deal of black, white, and green. Mr. Tuckett, the late binder to the British Museum, took out a patent for extracting one colour from leather and substituting another by chemical action. This method, however, was in use and known long before he turned his attention to the subject, although he improved greatly upon the old practice. As the patent has long expired, it may not be out of place to give an extract from the specification: "Take dark chocolate colour, and after the design has been traced thereon, it is then to be picked out or pencilled in with suitable chemicals, say diluted nitric acid; this will change the chocolate, leaving the design a bright red on a chocolate ground." But to lay on the various colours with leather is, no doubt, by far the better plan. Paint has a tendency in time to crack, and, if acids are used, they will, to a certain