Textiles optical brightener


Optical Brighteners

Introduction of textiles optical brightener

Optical brightener brightening colors or mask yellowing by optically yield a brighter, fresher appearance. Its synonym name OBA which is also known as fluorescent whitening agent(FWA) or fluorescent brightening agent(FBA).

Baoxu chemical offers optical brightener agents in textiles as Table 1 below, Always pure powder, no reduction, and no filler.

Table 1 Optical brightener agent for textiles

CategoryItem nameCAS number
optical brightener

for textiles

BX OBA ER-I13001-39-3
BX OBA ER-II13001-39-3
BX OBA 4BK12768-91-1


Typical optical brightener for textiles is ER-I, ER-II, and 4BK. Always pure powder, no reduction, no filler.

  • optical brightener ER-I is also known as fluorescent brightener 199. It’s used in whitening and brightening polyester fiber.
  • optical brightener ER-II is also known as fluorescent brightener 199:1, used to whitening polyester, polyester/cotton, polyester/yarn, polyester/linen, and other blended fabrics. Both CAS number is 13001-39-3 and could be in powder or liquid form.
  • optical brightener  4BK(fluorescent brightener 113) is used in whitening cotton fabric and polyester/cotton blends.


For more info and selection of optical brighteners for various applications, please check our blog.