M/s Javerchand Khimji Rangwala offers 25 Percent White BB Exconc Optical Brightners. M/s Javerchand Khimji Rangwala is an ISO 9001:2000 certified company. The 25 Percent White BB Exconc Optical Brightners fall under the category of basic dyes. The C.I number of 25 Percent White BB Exconc Optical Brightner is Brightner 24. The 25 Percent White BB Exconc Optical Brightners are used in industries like cotton, viscose/rayon, paper and pulp.