Fluorescent whitening agents SWN (C.I.140) Chemical name: 7-diethylamino-4-methylcoumarin CAS NO.: 91-44-1 Molecular formula: C14H17NO2 Specifications: Appearance: white crystal powder Assay: 99% min (HPLC) Melting Point: 70-72°C Use:It is used in brightening acetate fiber, polyester fiber, polyamide fiber, acetic acid fiber and wool. Packing: 25kg/ fiber drum