To keep red hair color from fading, wait at least 2 days after dyeing your hair before you wash it. Use a sulfate-free shampoo and conditioner formulated for color-treated hair, and rinse your hair with cool water to help seal the hair’s cuticle and protect the color. Avoid swimming in chlorinated pools or saltwater, as these can dramatically fade red hair coloring, and wear a hat if you’re going to spend a lot of time in the sun. In addition, you can protect your red hair color by having…