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，否涂料纸在矮境况下，学纸浆硫物及增添料洋磕酸矾土感，使纸背上金、银不朱发黑而获得光华。