I’ve heard of this before, but have not tried it. It makes sense to try it with new jeans unless you want them to fade. Obviously this is only for garments that you ordinarily wash. I doubt that these items willl never fade, but this method perhaps slows down the process.
The linked article also has some ideas on those “color magnets” that are supposed to absorb excess color in your washing machine. I will continue to sort my clothes by lights, darks, whites, delicates to avoid damage.
Click title for link at the Stretcher.