our factory:SHANXI QINGSHAN CHEMICAL INDUSTRY CO., LTD is established in August 1996 and now itis a high-tech enterprise with researching, manufacturing, marketing and service as a whole on OPTICAL BRIGHTENER Our products are widely used in Textile,Cotton, Paper-making, Plastic & Detergent industry, products lists: ER,4BK,VBL,BBU,BA,OB,OB-1, CXT, CBW, DMS,AMS, 31#,CBS-X,CBS-L,etc. Our products quality is superior & stable.We have obtained ISO9001& 2000 certificate. Undergoing years-efforts, we win the high reputation and ranked as one of the biggest professional manufacturers of Optical Brightener in China, meanwhile we exported to over 10 countries. We are designated by severalworld famous multinationalgroup:Unilever, P&G, Henkel as their purchase supplier.