Optical brighteners agent also is known as fluorescent whiteners, is widely used in the paper, detergent, plastics, textile industries. They are used to brighten products by achieving a whitener looking.

Typical optical brighteners are listed as follows;

1. Paper, optical brightener VBL, and BBU.

2. Detergent, optical brightener CBS-X.

3. Plastics, optical brightener OB, OB-1, KSN, KSB, KCB and, FP-127.

4. Textile, optical brightener 4BK, ER-I, ER-II and EBF.

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