Dark and black jeans tend to fade after time. You can restore the original color with coffee grounds! Simply steep 1/4 cup of coffee grounds in a gallon of water for 10 minutes. Now, pour this in to your washing machine. Add the jeans, without soap, and run on the gentle cycle. The tannins in the coffee will infuse the fabric’s fibers with compounds to darken the color. Run your washer on the rinse cycle along with 1 cup of white vinegar to rid any residue.