1. improve the washing effect;

　　Reasons for yellowing of fabrics: First, the macromolecules that make up the textile fibers are yellowed by the action of light, heat, climate, and other chemicals; secondly, due to natural dirt (such as dust) attached to the surface or inside of the fibers and the human body. Physical attachment of secretions (such as sweat) and the formation of redox, yellowing and hot yellowing of these secretions.

　　Fluorescent whitening agent itself has no decontamination ability, only whitening and brightening effect. The effect of this effect and the clean surface of the cleaned surface after washing and decontamination has a common result of light reflection, so that the washed object visually looks more. Clean, white items look whiter and reduce the yellowing of the fabric during use and washing, making the color and pattern of light and printed fabrics more distinct and brighter.

　　2. Improve the appearance of washing powder and soap;

　　Factors affecting appearance: the amount of fluorescent whitening agent (VBL is 0.15%; fluorescent whitening agent 31 is 0.25%, CBS-X is 0.3%; CXT is 0.5%), and the color and fluorescence of fluorescent whitening agent increase. The color tone of the white powder (the whiteness of the powder of the washing powder is large, and the whitening effect is large when the same amount of the fluorescent whitening agent is added).