1. INNOVATIONS IN DYEING OF COTTON WITH INDIGO R.B.CHAVAN, S.JAHAN, J.N.CHAKRABORTY Department of Textile Technology Indian Institute of Technology Hauz-Khas, New Delhi 110016

13. NaOH Equivalence of Organic Alkalis 2.43 3.81 2.24 2.94 Organic Alkali I Organic Alkali II Organic Alkali III Organic Alkali IV NaOH Equivalence (1gm) Organic Alkali

15. Effect of Different Alkalis on Indigo Dye bath Stability and Colour Build up 100/15 110.0 63.5 104.6 124.4 100/14 121.1 - 137.5 155.8 100/14 118.6 148.5 140.1 146.1 100/13 133 155 133.6 143.1 100/13 128 142 131 139 NaOH Organic Alkali I Organic Alkali II Organic Alkali III Organic Alkali IV 8hrs 6hrs 4hrs 2hrs 0hrs Alkali

17. CHANGE OF pH WITH TIME BEFORE PADDING 11.4 10.3 9.6 10.1 10.2 11.4 10.5 10.0 10.4 10.5 11.5 10.6 10.3 10.5 10.5 11.6 10.7 10.5 10.7 10.6 12.3 10.8 10.6 10.8 10.8 NaOH Organic Alkali I Organic Alkali II Organic Alkali III Organic Alkali IV 8hr 6hr 4hr 2hr 0hr Alkali

19. Effect of Number of dips on Alkali Consumption 17.5 15.8 14.8 29.9 16.2 14.3 12.2 28.1 15.0 13.1 9.5 20.5 12.5 11.8 8.7 21.8 11.2 9.2 7.8 18.7 10 7.9 6.9 12.5 NaOH Organic Alkali I Organic Alkali III Organic Alkali IV 6 5 4 3 2 1 % Consumption of alkali after each dip Alkali

21. Effect of Number of dips on Na 2 S 2 O 4 Consumption 89.2 89.0 81.7 83.0 78.5 80.8 79.8 76.7 67.8 80.0 73.1 67.8 60.7 74.5 67.3 58.9 53.5 67.2 61.5 53.6 48.2 52.0 40.3 37.5 NaOH Organic Alkali I Organic Alkali III Organic Alkali IV 6 5 4 3 2 1 % Consumption of Na 2 S 2 O 4 Alkali

24. SIMULATION OF COMMERCIAL DYEING PRACTICE 11.9 10.7 16.3 19.7 12.3 10.9 16.7 20.7 NaOH Organic Alkali I pH K/S pH K/S Sample of the 7 th day Sample of the 1 st day Alkali

29. Fe(OH) 2 AS REDUCING AGENT