Optical Brightener CBS-X C.I.: 351 CAS NO.: 27344-41-8 Appearance : yellowish green crystalline powder/granular Max. uv Absorption Wavelength: 348 nm Extinction Coefficient: 1140 Moisture:5%max Indissoluble Substance (in water): 0.5%max E1: 1150+/_38 In Ultra-Violet Range: 348-350nm