a signature has to be appended, or when the form serves as a blank for written additions, a half-sized paper is obtainable in similar qualities and tints.
Tissue papers are strong, thin papers, the best quality being made from hemp or rag fibre, well beaten, with no loading or sizing, made in blue or cream, usually double crown in size; other qualities are made from mixtures of rag, chemical wood, and straw, in various proportions and in various weights. Tissues serve a large number of purposes, as wrappings for high-class goods, therefore they must be strong and free from chemicals, for fly-leaves for the protection of engravings and prints, and also for the basis of carbon papers which are used for obtaining a simultaneous copy of written or typewritten documents.
Copying papers are similar in all respects to tissues, but some varieties have a small amount of mineral matter added to increase their efficiency. Made in cream wove, blue wove, and buff, put up in reams of 500 sheets, copying papers are used for press copying correspondence which has been made in copyable ink. Special typewriter ribbons are supplied, but most typewritten matter copies without trouble. The leaf of the copying book is damped, the excess of moisture removed by an absorbent sheet, the document inserted, the book closed, and pressed in the copying press. By this means copies of orrespondence are preserved for reference. Copying paper is also made up in rolls for copying machines which carry out the damping and copying automatically.
Cover papers are obtainable in many qualities, colours, and sizes. The materials used in their manufacture run through the whole range of papermaking fibres, the best qualities having a good proportion of rag fibre, while the low grades have some quantity
