Why is light color underwear washed and dried to be able to turn yellow

Why is light color underwear washed and dried to be able to turn yellow

If there is bleach on your hands or in the washtub when washing your underwear, it will change color when it comes into contact with it. Be careful when washing your clothes. Additional, underwear does not have enough clear water to wash thoroughly after catharsis, let redundant wash agent remain on clothings, can make underwear turns yellow likewise. Undergarments that have been exposed to the sun also turn yellow.