If you have to wet your hair in between shampoos, use products that are good for in-between washes, like this apple cider vinegar rinse, suggests Brown. "These [kinds of products] help you feel clean but without stripping the color," says Brown. She also advises using the coolest water you can stand because hot water will strip color.
Brown likes this hair mask, which nourishes strands and also revitalizes hair that's dulled. If they don't have the red color you want (copper is shown here), you can mix two shades together to create one that works for you.