Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/135

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occasion, put a few drops of milk into the glaire. Again allow it to dry thoroughly. Put some fresh copperas into a pan, and some solution of salts of tartar into another, and soak each brush in its liquid. Place the book upon the rods, the boards extending over and the book hanging between. Should it be desired to let the marble run from back to foredge the back must be elevated a little, and the rods supporting the boards must be level from end to end. If the marble is to run from head to tail, elevate the ends of the rods nearest to the head of the book. The elevation must be very slight or the water will run off too quickly.

Place a pail of water close at hand, in it a sponge to wash off; and a bunch of birch to throw the water with. A little soda should be added to soften the water. Charge each brush well, and knock out the superfluous colour until a fine spray comes from it. A little oil rubbed in the palm of the hand, and the brush well rubbed into it, will greatly assist the flow of colour from the brush, and also prevent the black colour from frothing. Throw some water over the cover in blotches with the birch, just sufficient to make them unite and flow downwards together. Now sprinkle some black by beating the black brush on a press pin, as evenly and as finely as possible. When sufficient has been thrown on, beat the brown in like manner over the extended boards. When the veins are well struck into the leather, sponge the whole well with clean water. Have no fear in doing this as it will not wash off. Then set the book up to dry.

Tree-marbles.—The cover is to be prepared and sprinkled in the same manner as stated in marbling; the boards, however, must be bent a little, and a little water applied by a sponge in the centre of each board to give the necessary flow of water; when the water is thrown on, it will flow towards the centre or lowest part of the boards, and when the sprinkle is thrown on, a tree, as it were, will be