<![CDATA[EC21 Product Catalogs - optical brighteners]]> <![CDATA[Optical Brightener for POLYMER FP-127, CBS-127, Oba 378 Cas No.40470-68-6]]> <![CDATA[Optical Brightener / Optical Brightening Agent FP-127/ Fluorescent Whitening Agent]]> <![CDATA[Liopal OB]]>