Posters collecting today is for both fun and profiit. Yet, the poster you thought was going to increase in value year after yearhas suddenly turned yellow after only three months and is now worthleess. What happened? What could have been done to prevent the yellowing? This article will discuss how paper is made. What materialls are best suited for long term storage and the guidelines for proper preservation.
How Paper is Made
Paper generally has plant fibers that have been reduced to a pulp, suspended in water and then matted into sheets. The fibers in turn consist largely of cellulose, a strong, lightweighht and somewhat durable material; cotton is an example of almost pure cellulose fiber. Although cotton and other kinds of fiber have been used in paper making over the years, most paper products today are made from wood pulp.
Wood pulps come in two basic varietiess: groundwood and chemical wood. In the first process, whole logs are shredded and mechanically beaten. In the second, the fibers are prepared by digesting wood chips in chemical cookers. Because groundwood is the cheaper of the two, it is the primary component in such inexpensive papers as...
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