Urea has a certain effect on the color amount and vividness of the reactive dyes, and the fixation of the disperse dyes on the polyester. Moreover, it also has a significant effect on preventing yellowing of cotton fibers due to alkali agents at high temperatures. However, it melts, evaporates, and decomposes at a high temperature of 131°C. It forms a co-melt with disperse dyes and promotes the diffusion of disperse dyes into cotton fibers, resulting in severe contamination. It can also promote the contamination of polyester with the reactive dyes. The result of the contamination of the two fibers will reduce the vividness after printing and also affect the color fastness. Therefore, adding urea to the color paste has both advantages and disadvantages, and it needs to select a reasonable amount.

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