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  Advanced chemicals Specialities was introduce in Pakistan in 1992, providing the services at its level best. As time passes, the productivy in chemical sector increases.  
   
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  OBAs OBAs
  Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs) or fluorescent whitening agents (FWAs) are dyes that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm). Fluorescent activity is a short term or rapid emission response, unlike phosphorescence, which is a delayed emission. These additives are often used to enhance the appearance of color of yarn and fabric, causing a perceived "whitening" effect, making materials look less yellow by increasing the overall amount of blue light reflected.
 
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