In the dyeing process of fiber yarn, line or fabric , in order to promote uniform dyeing without color bars, spots and other added substances, leveling agents are here to use. Most of the leveling agents are water-soluble surfactants, which are divided into two types according to the effect of leveling agent on the diffusion and aggregation of dyes: one is fibrous leveling agent, which has little effect on the concentration of dyes.
http://www.ezalchemical.com/dy....eing-auxiliary/level
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