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In dyeing cotton fabric with the Indigo Pulverata Levis, this research examined the effect of the sodium dithionite(Na2S2O4). For the separation of the Indigo-calcium hydroxide complex in the alkaline solution of the Indigo Pulverata Levis, the reduction with the Na2S2O4 at 25℃ was more effective than the solution boiling. The concentration of Indigo in the cotton fabric increased with the increase of Indigo Pulverata Levis, but the concentration of indirubin did not increase particularly. The optimum temperature for the reduction was 60℃, and K/S value of dyed fabric decreased at over 60℃. The concentration of indigo and indirubin in the cotton fabric decreased as Na2S2O4 concentration increased. In treating cotton fabric dyed with the Indigo Pulverata Levis by the Na2S2O4, the concentration of indirubin decreased and the surface color of dyed cotton changed from purple blue to blue while the treatment temperature was getting higher.

The Effect of Sodium dithionite in Dyeing with Indigo Pulverata Levis