许多贵重的书籍日趋毁灭、化为粉絮。从上个世纪中期起生产的纸浆纸用来印刷的大量贵重书籍,经过一百多年的时间,发生自行腐蚀的现象,变成粉末碎片。整本书就像是酥糖一样,又松又脆,碰一碰就成一堆纸絮。这个现象早在一九七六年就已出现。今天,美国国会图书馆的一千七百万册藏书中,百分之三十五,即六百万册出现了严重的破损状态。好好的书,怎么会变成粉末或碎片?据法国国立图书馆向政府提出的报告说,最初整面书纸呈现黄褐色,再发展下去,从边缘部分起出现碎裂。越是将书放在有阳光或通空气的地方,自行风化的速度越快。各国发现了一个相同的现象,即在时间上,大约一百多年前用木材纸浆纸印刷装订 Many expensive books are increasingly destroyed and turned into flocs. A large number of expensive books printed on pulp paper produced since the mid-2000s have spontaneously corroded over a hundred years into powder fragments. The whole book is like a crisp candy, but also loose and crisp, touching a pile of paper. This phenomenon has already appeared in 1976. Today, 35% of the 17 million books in the Library of Congress are severely damaged by six million copies. How can a good book become a powder or a fragment? According to a report to the government by the French National Library, initially the whole book was yellowish brown, and then further developed, fragmenting from the periphery. The more the book on the sun or the air through the place, the faster weathered. The same phenomenon was found in various countries, that is, in time, about 100 years ago, the book was printed on wood pulp paper