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PAPER AND ITS USES
Grass-bleached Tissues.—This term is applied to special tissues to describe papers quite free from chemicals. The ideal method of bleaching linen is by exposing on grass, and though these tissues are not treated in that manner, the ideal papers which will not tarnish silver or other bright metal goods are so described. Used for wrapping silver goods, and for protecting metal decorations and buttons on uniforms.
Greaseproof Papers.—Used for packing butter, lard, and other provisions; may be prepared as such in the pulp by prolonged beating, "wet" pulp being the result of long beating. The resulting paper is close, transparent, and, with ordinary sizing, is greaseproof. Other papers are rendered greaseproof by immersion in a bath of albumen and salt, this giving the paper an impervious coating. Vegetable parchment papers are used for similar purposes.
Grocery Papers.—The well-known blue sugar paper and purple sugar bags are examples of this class of paper. They are made of low-grade pulps, with which are mixed waste papers, a moderate amount of loading, and aniline colours. The squares are cut at the mill and bags too are often produced at the paper mill.
Hosiery Papers.—These are special heavy white wrapping papers, prepared to stand a good amount of handling, used as wrappers for packets of hosiery stock, and for similar purposes.
Imitation Art Paper.—To meet the demand for a cheaper paper than art paper, with some of the characteristics of the latter, such as opacity, absorbency, and a surface suitable for printing half-tones, imitation art papers have been introduced. They contain a large proportion of loading, and receive a good surface, the water finish being usually adopted. Stocked in double crown, double demy, double royal, quad crown, and quad demy.
Impression Papers.—Another term for duplicating papers. See Duplicating Papers.
Index Boards.—Pulp boards made of strong stuff, even, hard-sized, well-rolled, giving a good writing surface. It is important for card index systems to employ a card which is made in one thickness only; pasteboards bend and split
