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International Journal of Interdisciplinary Research

Table 9 Colour fastness value of the fabric dyed with crude indigo dye and synthetic indigo dye

From: Extraction of Indigo dye from Couroupita guianensisand its application on cotton fabric

  Samples K/S Rubbing fastness Washing fastness Light fastness
CCa CSb
Dry Wet   Cotton Wool
Crude indigo dye 50% 0.909 4 – 5 4 – 5 4 4 – 5 4 – 5 6 – 7
100% 1.9941 4 – 5 4 – 5 4 4 – 5 4 – 5 7/7 – 8
150% 4.0122 4 – 5 4 3 – 4 4 – 5 4 – 5 6 – 7
Synthetic indigo dye 2% 4.1921 4 – 5/5 4 – 5 4 – 5 4 4 – 5 7/7 – 8
4% 4.4034 4 – 5/5 4 – 5 3 – 4 4 – 5 4 7 – 8
  1. aCC – Colour Change.
  2. bCS – Colour Staining.