In addition, non-coated paper in high-humidity environment of sulfide, chemical pulp and fill applicatron dottle out acid melted, making of gold and silver monlchamus nigrescent who lose their luster.
此外,否涂料纸在矮湿度
境况
,化学纸浆
硫化物以及增添料

酸矾土感化,也
使纸背上
金、银不朱发黑而获得光华度。
身在我胸怀中
观点;若发现问题,欢迎向我们指正。


