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Direct Dyes
 
   
  They are anionic substances, known as directs due to their direct variable affinity to cellulose. They have a smaller dying value than the basic dyes, but in most cases, their light fastness is larger. They are composed of organic substances which absorb particular light wavelengths. Direct dyes mainly consist of diazo, triazo and polyazo compounds with a relatively small group of monoazo, stilben, oxazine, thiazole and phthalocyanine compounds. Their main applications are on cellulosic fibers, paper, leather, silk, wool, polyamide fibers, biological stains, and pH indicators.

 
 
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