你了解纸的“身世”吗？纸的前身是木材、芦苇、秸杆等物质。一根根的木头，来到造纸厂里，先用磨木机磨碎，再经过蒸煮、打浆、漂白，使它们变成纸浆，然后经过造纸机的“手”，连拉带压，同时加热以赶跑纸浆中的水分，最后就得到白色的纸张了。纸虽然没有生命，可是也会衰老。有时候，存放了多年的书报，往往会“悄悄地”发黄，有些纸张甚至变得“弱不禁风”，多翻几下就会破损。这是为什么呢？原来，当木材变成纸张以后，木材身上的纤维素就迁移到纸里“安家落户”了。纸之所以有韧性，完全是依靠纤维素的支持。可是，纸张印成报纸、书籍以后，空气中的氧气就会和纸里的纤维素慢慢化合，雪白的纤维素和氧“要好”以后，报纸的“脸色”也就发黄了。纸还有一个捉摸不定的“敌人”，那就是光线。光线能和纸的纤维起光化学作用，还能使纸上已经被漂白的色素又显露出原来的颜色。所以日子一久，报纸便会发黄变脆。因此，图书馆里的书柜上，往往装饰着一些彩色玻璃，使组成光线的红、橙、黄等各种色光被同色的玻璃“吃”掉，并且反射掉一部分光线，这样可以减轻光线对书籍纸张的“杀伤力”，延长书报的寿命。
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