A model is proposed to explain the manner by which the uptake of direct dyes on cellulosic fibres is promoted by a reduction in the liquor ratio used for dyeing. According to the model, which invokes the concept of interstitial water in dyeing, reducing the liquor ratio promotes dye aggregation which reduces the solubility of the dye in the bulk dyebath phase, so that the inherent preference of the dye to favour the aqueous phase shifts towards the fibre phase. It is suggested that the same mechanism accounts for the promotion of direct dye uptake imparted by the addition of inorganic electrolyte to direct dye dyebaths. As such, reduced liquor ratio and added inorganic electrolyte exert a combinatorial promotional effect on direct dye uptake.

提出了一个模型来解释通过减少染色所用的液比来促进纤维素纤维上直接染料的吸收的方式。根据该模型，该模型在染色过程中引入了间隙水的概念，降低液比可以促进染料聚集，从而降低染料在本体染浴相中的溶解度，从而使染料固有的偏爱水相的倾向转向纤维相。建议相同的机制解释了通过将无机电解质添加到直接染料染浴中而促进的直接染料吸收。这样，降低的液体比率和添加的无机电解质对直接染料的吸收起组合促进作用。