Both the colour strength of 2% omf dyeings and the extent of dye exhaustion achieved for three commercial grade direct dyes on cotton were promoted by the addition of 20 gl⁻¹ NaCl at each of eight liquor ratios (1:50, 1:20, 1:10, 1:6, 1:3, 1:2, 1:1.5 and 1:1). The extent of electrolyte-enhanced dye uptake decreased with decreasing liquor ratio. For each of the three dyes, unlevel dyeings were obtained at 1:1 liquor ratio only in the presence of added electrolyte, whereas level dyeings were secured even at 1:1 liquor ratio in the complete absence of added electrolyte. The depth of the dyeings obtained in the absence of added electrolyte using both 1:1 and 1:1.5 liquor ratios were of similar magnitude to those secured using 1:10, 1:20 and 1:50 liquor ratios in the presence of 20 gl⁻¹ NaCl. The promotion of dye uptake imparted by both added electrolyte and reduced liquor ratio were interpreted in terms of their effects on the substantivity of the direct dyes towards the cotton substrate. It is proposed that adding electrolyte to the dyebath and reducing the liquor ratio employed for dyeing have the same consequence in terms of enhancing dye uptake, namely that of encouraging dye aggregation in the dyebath which reduces the aqueous solubility of the anionic dye, which, in turn, results in the inherent preference of the dye to favour the aqueous phase shifting towards the fibre phase.

二者的2％的色强度OMF染色和对棉花三个商业级直接染料实现染料吸尽的程度通过加入20 GL的促进^-1 NaCl的每八个浴比（1:50，1:20， 1：10、1：6、1：3、1：2、1：1.5和1：1）。电解质增强的染料吸收程度随液比的降低而降低。对于这三种染料中的每一种，仅在添加电解液的情况下才以1：1的液体比率获得不均一的染色，而在完全不添加电解液的情况下，即使以1：1的液体比率也可以确保均相的染色。在没有添加电解质的情况下使用1：1和1：1.5溶液比率获得的染色深度与在20 gl存在下使用1：10、1：20和1:50溶液比率确保的染色深度相似^-1氯化钠 通过添加电解质和降低液比来促进染料吸收，可以解释为它们对直接染料对棉底物的直接性的影响。有人提出，在染浴中加入电解质并降低用于染色的液比在增加染料吸收方面具有相同的结果，即，促进染料在染浴中的聚集会降低阴离子染料的水溶解度，这在染色中会降低染料的水溶性。反过来，导致染料固有的偏爱于使水相向纤维相转移。