Txij li thaum nws tsim nyob rau hauv 1998, Shandong Subang Fluorescence Technology Co., Ltd. tau tsuas yog tsom rau R & D, ntau lawm thiab muag khoom ntawm fluorescent whitening agents thiab lawv intermediates.
Nyob rau hauv Yucheng, Dezhou City, Shandong Subang mob siab rau rau R & D, tsim thiab muag ntawm optical brighteners txij thaum 1998.