By Yash Pal. Kathpalia
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The flesh side is somewhat darker, but retains ink better. Vellum is costly. Its hair side is slightly darker and yellow,while the flesh side tends to be nearer white. Before the widespread manufacture of paper, parchment and vellum were commonly used for books. Their use was later restricted to certain important documents. The skin of such animals as sheep,lamb,goat or calf is cleaned ofits hair and wool by washing and soaking in a lime pit, and then stretched on a frame and the remaining hair or flesh removed.
The dehumidifier has no effect on the temperature. Silica gel and anhydrous calcium chloride are also effective in a closed room. T o dehumidify 25 m3of air space,approximately 3 kg ofsilica gel are required. As it absorbs moisture, the silica gel becomes pink and can be regenerated to its bluish colour by heating in an oven. Another chernicalwhich has been used is slaked lime in earthen pots. Once saturated,it cannot be used again. In air-conditionedareas,faulty ducts may be responsible. The remedy is to reshelve the volumes, circulate the air with fans to prevent the formation of pockets, clean the infested area and volumes, and redesign the ducts in the airconditioned area.
The earliest inks used were strong solutions of aniline dyes in 45 Conservation and restoration of arGhiue materials spirit or water. Glycerine was added in small quantities to prevent the ink from drying too rapidly. Modern typewriter inks are almost identical with printing inks, and insoluble pigments are used to a large extent, INK F O R C A R B O N PAPERS When only a few copies are required, tissue paper backed with specially prepared inks is commonly used. The ink consists of a wax base containing lampblack or wax soluble dyes,and is applied to thick, strong paper.
Conservation and Restoration of Archive Materials by Yash Pal. Kathpalia