The absorption isotherms of Congo Red (C. I. No.370) and Benzopurpurine 4BKX conc. (C. I. No.448) at 90°C from baths containing 0.05×10
-3, 1.0×10
-3 and 1.0×10
-3 mol dye with varying salt concentration of 0.05_??_3.0 mol NaCl per kg dyeing liquor were determined using the photoelectric colorimeter and the relations between the chemical constitution of dyes, the aggregating properties of dye andions and the affinity for cotton were studied.
The presence of CH
3 group in the dye molecule increases the affinity of dye for cotton, but that of SO
3Na group decreases the affinity. The aggregating tendency of the dye in solution increases with increasing affinity of the dye. The effects of salting out by the electrolyte upon the dyeing properties are found to be seriously great.
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