The dye uptake and fixation rate increase with the decrease of bath ratio in a fixed range; the increase rate of different dyes is different, and the rate of fixation and dye uptake is also different. Generally, the increase of dye uptake is faster than that of fixation.

Because low bath ratio dyeing can not only speed up the dyeing rate, but also improve the fixation rate, it can reduce the salt consumption, that is, low salt dyeing, and improve the utilization of dyes and alkali agents. Moreover, low bath ratio dyeing can reduce the consumption of energy and water, reduce the amount of salt and alkali agent, reduce the amount of dye, and improve the reproducibility and levelness of dyes.

Although dyeing with low bath ratio has many advantages, there are also many difficulties in realizing low bath ratio dyeing. The lower the bath ratio, the greater the risk and difficulty of dyeing. It is required that the solubility and stability of dyes used in small bath are better than those of dyes used in dyeing, especially when dyeing dark color varieties and mixing of several dyes, the dependence of different dyes on bath ratio is different.

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