... of a whiteningagent, such as TiO2, the use of OB-1 will produce a brilliant white or “white than ... agent, such as TiO2, is used,the level of OB-1 required will likely be lower than when a ... users perform sufficient evaluations to determine the optimum level of OB-1 for theirspecific end uses.Ash %: 0.3maxEmpirical Formula: ... 0.3maxAssay %: 99minParticle Size: 200 meshes Optical Brightening Agent OB-1