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,否涂料在矮湿度
境况下,
浆
硫
物
及增添料洋
矾土感
,也会使
背上
金、银不朱发黑而获得光华度。