Salt for the coloreds instead of color detergent
My girlfriend advised me to use salt rather than a color detergent.
She said it was cheaper than some commercial products and very effective against color loss and protects the colors.
Now I've tested it for some time and it seems to actually work, 1 TL I've added to every wash the detergent and it makes the laundry even wonderfully soft, so you can even save the softener in some cases.
I think the colors look fresh and can not tell the difference, so it was right and it works just like Color Detergent.