Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/201

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Dust.—The careful application of india-rubber or bread will generally take away all dust. In using india-rubber, hold the sheet or leaf down by the left hand, and rub gently away from it. If the rubber is used in a to and fro motion, there is great danger of the sheet doubling back and breaking. The bread may be used in a circular motion; and if a book be cleaned from dust by this means without pulling to pieces, all crumbs mast be brushed away from the back very carefully before closing the book. Water stains.—If the stains be from water, the application of boiling water and alum will take them out. This stain is the one most usually found in books, it may be distinguished from other stains by leaving a mark having a sharp edge. To take such a stain away, pull the book to pieces, strew on the bottom of the pan a handful of powdered alum, on this pour a quantity of boiling water. Immerse each section leaf by leaf in the liquid, and allow to remain for some hours. It may be found rather difficult to get the sheets to go under the water; and as one cannot press them under by hand, on account of the heat, make a substitute by wrapping strips of linen on the end of a piece of wood; keep this handy, it will be found very useful; being round at the end, and soft, it does not tear or go through the paper, as will anything sharp. The alum water will, after a time, become very discoloured; this is only the stain and other dirt extracted from the paper; throw this away by tipping the dish, or by the use of the syphon; add fresh water, either warm or cold, but preferably warm, to dissolve any excess of alum that may have soaked into the paper, and to further clear it. After a time the whole book may be taken out, placed between pressing boards, and excess of water pressed away by the laying