Why does the water used to wash denim turn yellow? Can the yellowing of denim jackets be washed out?

Denim is a very common clothing fabric. Denim clothes and jeans are commonly worn by everyone. When washing denim clothes, you should pay attention that some denim clothes are easy to fade, and oxidation of clothes will make them turn yellow.

If the jeans that have been washed are of good quality, they have been worn for a long time, and the stains on the jeans are washed away, then the water will turn yellow. There is another case where the dyeing technology of ordinary jeans uses sulfur dyes, so the water will turn yellow when washing. In this case, when washing jeans, soak them in salt water or white vinegar for a while before washing.

Yellow denim jackets can be washed out. First, prepare half a basin of water so that the clothes can be completely soaked. Then dissolve the laundry detergent with whitening and brightening function in the water, dilute and stir well, put the yellow denim jacket in and soak overnight, and wash the clothes the next day. Note that denim jackets should be avoided from being exposed to the sun. Before storing clothes, the stains on the clothes should be washed off as completely as possible. Because organic matter that has not been completely washed off remains on the clothes, after a long period of oxidation, these residual small molecules will undergo chemical changes on the surface of the clothes, causing the color to turn yellow.

This is a very normal situation. One is that the clothes are stained with sweat, dirt, etc., which will turn yellow after washing. Another is that dark clothes will turn yellow when washed. In this case, the dyeing is not strong and the fixing agent is not enough, which leads to the problem of fading. Because the colors of clothes are mixed from red, yellow and blue in different proportions, red and blue belong to the cold color system and are usually not easily decomposed by water; in contrast, yellow will be separated. Coupled with the reaction with the air, yellow water will appear. Moreover, when most clothes are washed, yellow water will generally be washed out because water will dilute black stains. You can add a little salt to the washing water to achieve the effect of fixing the color, and the clothes will not be easy to discolor.

Jeans are made of coarse fabrics, divided into warp and weft. The warp is mostly indigo, while the weft is white. However, the indigo is easily removed during processing and then stained on the white yarn. The indigo stained on the white yarn is easy to turn yellow. Therefore, jeans will turn yellow after being washed.

Jeans are generally made of canvas fabric, which is relatively rough, with poor coloring and poor color fastness after dyeing. Therefore, the color will easily come out after washing in water. The yellowing of water is the reason for the fading of pants. The manufacturing process of jeans is relatively complicated, so there will be various problems that people cannot understand. Compared with clothes made of other fabrics, jeans are the easiest to fade. Generally speaking, the darker the color of jeans, the more serious the fading. Therefore, after buying new jeans, you must soak them in salt water, preferably in concentrated salt water. Dissolve the salt with warm water, then put the pants in the salt water and soak for about 30 minutes. After soaking, wash them normally again. After that, it depends on the effect of washing. If it still fades, you can soak it in light salt water again for about ten minutes. After soaking several times, the fading of the pants will be reduced.