Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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A heterogeneous material consisting essentially of cellulose (the principal constituent of the cell wall of all plants), hemicelluloses, lignin, organic extratives (essential oils, resins, and the like), water, and soluble salts. It is the raw material for making mechanical and chemical pulps used in the manufacture of paper, as well as numerous other products. Wood, usually in the form of sawdust and shavings, is also used extensively as an inexpensive source of cellulose in a wide variety of chemical processes. Wood bark, and wood itself to a lesser extent. is an important source of vegetable tanning materials.

Green wood contains approximately 40 to 60% water, while dry wood consists of approximately 50O carbon, 6% hydrogen, 40 to 42.5% oxygen, 1% nitrogen, and yields 0.81 to 3.3% ash.

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