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实验过程1．将旧挂历（或旧画报）擦净浸人热饱和珊砂（或硼酸）溶液中，取出晾干后，再浸入30％的明矾溶液中，取出晾干备用．2．将加厚白纸浸入30％的硝酸钾溶液中，取出晾干，再在浓硝酸与浓硫酸（体积比按1：2）混合液中浸泡10分钟，轻轻取出后放人静水中漂洗干净（因纸易
Experimental process 1. Wipe the old calendar (or old pictorial) with a hot saturated sand (or boric acid) soak solution, remove it and dry it, then dip it into a 30% alum solution and take it out for drying. 2. The thick white paper is immersed in a 30% potassium nitrate solution, taken out for drying, and then soaked in a mixture of concentrated nitric acid and concentrated sulfuric acid (volume ratio of 1:2) for 10 minutes. After gently removing, it is rinsed in calm water. (Since paper is easy