Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/134

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will have a very pretty effect, and may be made emblematical. A fern or other leaf for botanical work as an instance. The sprinkle must in these cases be very fine and dark for the better effect. The leaf or design being lifted from the cover when the sprinkle is dry, will leave the ground dark sprinkle with a light brown leaf or design. Cambridge calf is done in this way by cutting a square panel of mill-board out and laying it on the sides. The square on the cover may be left brown or may be dabbed with a sponge.

Marbles.—As the success of marbling depends upon the quickness with which it is executed, it is important that the colours, sponges, brushes and water, should be previously disposed in order and at hand, so that any of them can be taken up instantly. Another point to which attention must be directed is the amount of colour to be thrown on, and consequently the amount that each brush should contain. If too much colour (black) is thrown on, the result will be an invisible marble, or, as I once heard it expressed by a workman, "it could not be seen on account of the fog;" if too little, no matter how nicely the marble is formed, it will be weak and feeble.

Marbling on leather is produced by small drops of colouring liquids, drawn, by the flowing of water down an inclined plane, into veins and spread into fantastic forms resembling foliage—hence, often called tree-marble. It is a process that requires great dexterity of hand and perfect coolness and decision, as the least hurry or want of judgment will ruin the most elaborate preparation.

To prepare the book paste-wash it evenly all over, and to further equalize the paste-water, pass the palm of the hand over the board after washing it. When dry, wash over with a solution of salts of tartar two or three times to get the desired tint. When dry, glaire the whole as even as possible, and to diminish the froth that the sponge may