Why does the towel harden?
The hair becomes hard after using it for a period of time because the free calcium and magnesium ions in the water combine with the soap to form calcium and magnesium soaps that adhere to the towel and make the towel hard!
[The minerals (calcium, magnesium, etc.) contained in the water combine with the soap (containing fatty acid sodium) used in daily life to form water-insoluble precipitates, and these precipitates are further attached to the towel to make the towel hard.
What should I do if the towel becomes hard?
①After the towel becomes hard, it can be cleaned after being boiled in alkaline water for 10 minutes. Generally, 1.5 kilograms of water and 30 grams of soda ash can be washed to make it soft. ②It can be washed with concentrated brine and then rinsed with water to make it refreshing. ③The gold spinning is soaked. ④ When the rice is washed and boiled, the towel will be as clean as new, or a few drops of white vinegar will be added when cooking!
