I wear lots of black clothes made of natural fibers. The black fades with every wash and reduces the life of the article of clothing.
I began using this product 2 years ago and my black (and other dark colors) do not fade. My clothes look newer longer. It really works, just follow temperature instructions on your garments.
My wife prefers this laundry detergent for ALL our clothing - light or dark !! It is high priced at the supermarket, great price at Costco, but they don't stock it consistently !! We now will keep buying online .