Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/185

Rh The state of the weather must in a great measure guide the finisher as to the proper number of volumes he ought to prepare at one time. The leather should always be a little moist, or, in other words, rather fresh. In winter double the number of books may be prepared, and the gold laid on, than the dryness of a summer's day will permit. If books are laid on over night the tools must be used very hot in working them the next morning, or the gold will not adhere. During summer, flies will eat the glaire from various places while the book is lying or standing out to dry, so that constant vigilance must be kept to avoid these pests. Russia is prepared in the same way as calf, but is usually worked with more blind tools than gold, and the sides are not as a rule polished, so that the size and glaire are dispensed with, except on those parts where it is to be finished in gold; those portions need be only paste-washed and glaired once, without any size.

Finishing with Dry Preparation.—The dry preparation is used for silk, velvet, paper, or any other material that would be stained by the employment of the wet process. There are a number of receipts in the trade and in use.

Take the white of eggs, and dry by spreading it somewhat thickly over glass plates, taking care to preserve it from dust. When dry it will chip off readily, if the glass has been previously very slightly oiled or greased. It must not be exposed to more heat than 40° Reaum., or the quality of the albumen will be destroyed. The dried mass is to be well powdered in a porcelain mortar. Or, take equal portions of gum mastic, gum sandrac, gum arabic, and powder them well in a mortar. This powder, if good work be desired, must be ground into an impalpable powder. When powdered put it into a box or bottle, and tie three or four thicknesses of fine muslin over the mouth. By tapping the inverted box, or shaking