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Optical Brightener is one chemical additives, powder whitening agent for polyester and rubber. CAS No 1533-45-5, C.I.393, the appreance is bright yellowish green crystal powder. The purity is as high as 99.5%. It has OB-1 and OB powders. The dosage should be very low, should be between 0.01-0.05%. For plastic application, normally use OB masterbatches for more easy operation.