The white bath towel has yellow and black spots.

1. The towel will turn yellow if it is not dehydrated cleanly.

Unclean dehydration: if the towel is not dehydrated in washing, it will form the residue of alkaline chemicals, which will remain in the towel fiber, leading to the hardness of the towel and the decline of the fastness of the towel.

2. Alkaline chemicals are safe for cotton fibers in the washing process and will not damage towel fibers. But if the dehydration is not clean, the residue of alkaline detergent will remain in the towel fiber, and the towel will become hard and soft after drying.

3. Residual chlorine bleaching agent is a strong bleaching agent in washing chemicals, which has certain damage to cotton fibers in cotton fabrics. It must be used and controlled reasonably in washing. If the concentration of temperature washing time is well controlled, it is safer. On the contrary, the temperature, concentration and quantity are not well controlled, the dehydration is not clean, and the residue formed on cotton fiber is harmful to cotton fiber. Causing the towel fabric to turn yellow and harden.

The standard operation of washing towels can reduce yellowing

The use of raw materials should be reasonable and appropriate, and it should be done according to the operating procedures: the last process of washing towels is neutralization with acid. If acid neutralization is not appropriate, the fabric will turn yellow and gray. In the washing process, towels are easy to turn gray and yellow because of their high hardness and poor water quality. These phenomena are often neutralized by acidic reagents to restore the whiteness of towels. Pay attention to the fact that cotton fiber is not afraid of acid and alkali when using. If pickling is often used, the service life of towels will be significantly reduced, so the dosage should be controlled. When the pH value of cotton fabric is adjusted to 5.5 ~ 6.5, the pH value of human skin is basically the same.

Cleaning method:

1. It is advisable to put the towel in the pot and drown it with water, then sprinkle a handful of alkaline noodles and cook for 5 minutes, then rinse it with hot water.

2. Add orange peel with rice washing water, boil it, put in a yellow towel, and gently rub it to remove the yellow.