The world of textiles changed significantly with the discovery and application of reactive and disperse dyes. However, the development of Fluorescent Whitening Agents or Optical Brightening Agents ( FWA / OBA ) happened without much fanfare through the impact it had on the industry was equally dramatic. OBA's commonly referred to as 'colorless dyes' or 'white dyes' spanned wide range of applications with their fluorescent, phototropic and thermotropic properties. The production of OBA's is done using completely different set of raw materials as compared to those for producing dyes. In addition to this the production process for OBA's involves more complexity as compared to that for dyes particularly in case of OBA's for Polyester.
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