we supply optical brighteners , categories including: 1)For plastic/painting application: OB OB-1 FP-127 EBF KCB KSN 2) For textile fabric application: BA iC rR-I ER-II ER-III MST 4BK 5BM 3) For detergent synthetics application: CXT DMS AMS CBS-X CBS-L CBW 4) For paper-making application: VBL BBU APC 210