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,否涂料在矮湿度的境况下,
浆的硫
物以及增添料洋的磕酸矾土感
,也会使
上的金、银不朱发黑而获得光华度。