In the process of textile processing, formaldehyde mainly comes from the following three aspects: (1) Anti wrinkle finishing: cross-linking agents containing formaldehyde are still widely used in anti wrinkle, anti wrinkle, and non iron finishing, and improper use can cause their concentration to exceed the allowable range. (2) Improving color fastness: Cheap formaldehyde containing additives are often used for direct dyes and occasionally for post-treatment of reactive dye dyeing. According to the formula used, its content can easily exceed the limit of 20mg/kg in Class A products, and even exceed the limit of 75mg/kg for Class B products. Cationic additives with little or no formaldehyde are now available on the market, such as Silly A and B. (3) Pigment printing: High quality formaldehyde containing crosslinking agents are widely used in pigment printing processes, which means that even with careful use, it is almost impossible to meet the limit of 75mg/kg. There is now a supply of cross-linking agents with extremely low formaldehyde content, which can achieve the goal of formaldehyde free pigment printing when reagents with urea are used together with formaldehyde

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