What are the causes of yellowing after wearing and washing?

Let's first understand why our clothes are yellow and dirty at every turn! In fact, there are several reasons why clothes can turn yellow:

1. Stained with sweat, yellowing due to the oil secreted by the human body.

Sometimes we see yellowing on the inside of the collar or cuffs of white clothes, it is because the sweat stains and oil left on our bodies are still on the clothes, and if they are not thoroughly cleaned, the clothes will easily turn yellow.

2. Clothes are not stored properly or stored for too long, causing yellowing of clothes.

On the one hand, the yellowing of clothes is related to the water quality, if the water quality is hard, the hardness in the water will penetrate into the clothes after washing the clothes, making the clothes yellow; On the other hand, it is related to laundry detergent, the foam of the laundry detergent is not cleaned, and the residue is also one of the reasons for the hardening of the clothes.

3. Improper or uncleaned laundry, residual laundry detergent or soap will also make the clothes yellow.

4. The fluorescent agent in white clothes becomes weaker.

In order to cover up the stains, the merchants continue to add fluorescent brighteners to the laundry detergent and laundry detergent to make the clothes as white as new after washing. However, after the clothes are left for a period of time, they will turn yellow and lose their luster, which is caused by the accumulation and residue of fluorescent agents for a long time

And the longer the time, the more fluorescent agents accumulate, which not only cannot be rinsed off, affecting the appearance of the clothes, but also causing great harm to the body.

Clothes that are contaminated with sweat or human secretions, or that have not been rinsed after being washed with alkaline agents, or that have not been dechlorinated after a green ticket, will turn yellow. The reason is that all kinds of detergents and dirt contain certain iron ions, and if the clothes are not rinsed cleanly, the iron ions remaining on the fabric will make the clothes yellow. According to relevant information, more than milligrams of iron per litre of water will make clothes yellow.

Laundry detergents are alkaline, especially industrial laundry detergents (or heavy dirt laundry detergents, strong laundry detergents) are very alkaline. The higher the alkalinity, the higher the content of iron ions. Therefore, one of the purposes of excessive acid after washing is to neutralize the residual alkali and eliminate iron ions.

Sodium hypochlorite. After bleaching, it is also easy to turn yellow, because chlorine bleaching decomposes to produce caustic soda and free chlorine, which absorb carbon dioxide in the air when it is ventilated.

Eventually, soda ash is also generated.

and hypochlorous acid, these alkalis make the fibers strongly reduced, yellowed, and extremely difficult to deal with after yellowing. Therefore, chlorine bleaching requires deoxychlorine.

The aqueous solution contains sulfide and is not rinsed cleanly, which will also make the plant yellow. For example, chlorine bleaching is done with sodium thiosulfate.

After dechlorination, it is easy to form residual sulfur on the fabric, causing yellowing; Rinsing with sulfur dyes can also cause yellowing of clothing.

Oxalic acid. Although it has the effect of neutralizing the residual alkali, but oxalic acid is corrosive, after being too acidic, if it is not rinsed clean, the fabric will also be yellow, and the yellowing of the side ears after washing the carpet oxalic acid is the most classic. Therefore, glacial acetic acid should be used for fruit acid.

Oxalic acid should not be used.

The most common cause is that the body's sweat contains proteins, which then coagulate and denature and turn yellow.

The above methods can be effectively removed with bleach. So do your laundry, especially in the summer, and don't use hot water.

In addition, cotton products will also oxidize and yellow for a long time, bleaching has a certain effect, and frequent bleaching of clothes will shorten the lifespan, but now the clothes are changed more frequently, so there is no need to worry too much.

There are two reasons that may lead to this situation: one is that chlorine-containing products are used in clothes that cannot be chlorinated and bleached, or the material is damaged and yellowed due to alkaline detergent for alkaline detergents that are not alkaline-resistant, and this yellowing cannot be solved by itself, and you need to go to a professional laundry to recover.

In addition, one of the cherry blossoms is that the clothes are soaked for too long when washing, resulting in color stains on the clothes

If it is a garment that cannot be bleached with chlorine but can be washed without fading, then you can use colored clothes to clean the color stain with the collar of the blue moon to deal with it. Put the water that soaks almost the whole garment in the basin, then pour the color stain of the bottle cap and the collar of the bottle cap, mix the clothes and soak them for 2 hours (you can extend the soaking time), wash off the yellowing and rinse it with water to pull

Hope my sharing is helpful to you, thanks!

The reasons why white clothes will be white and yellow after washing may be due to the following reasons: 1. The detergent is not rinsed clean; 2. Overexposure; 3. Too many times of washing.

1. The detergent is not rinsed clean: after using detergent such as laundry detergent, if it is not rinsed clean, yellow or white stains will appear after drying. The garment can be washed again and dried again and the yellow or white stains will disappear.

2. Overexposure: If the clothes are not dried properly, the ultraviolet rays in the sunlight will accelerate the aging rate of the fabric, and the front will cause the clothes to turn yellow. After washing, clothes should be dried in a cool and ventilated place as much as possible, avoiding direct sunlight.

3. Too many times of washing: After many washes, the whitening agent in the fabric may gradually disappear, making the clothes look yellow and old.