How to wash jeans without fading?

Brine soaking prevents jeans from fading. 

This trick is most suitable for dealing with fading problems in denim and colored clothes, and the effect is very effective. To prevent fading of newly bought clothes, soak them in concentrated salt water for half an hour before they are put into the water for the first time, and then wash them according to the usual method. If there is still a slight color fading, you can soak it in light salt water for ten minutes before each washing in the water. If this goes on like this, the clothes will never fade. Usually when washing, if you can turn them inside out and then rinse and dry them, you can also minimize the degree of fading. (This method can effectively solve the fading method of jeans)