If you've died your hair red or blond, Leave on your hair 15 minutes and you'll notice the difference. The longer you leave it, the greater the color deposit. It will help maintain your red hair or warm up your blonde by adding a reddish tint. It does nothing for non-died hair especially darker colors. It doesn't dye your tub or shower, sink or counter top if you rinse it off right away. If you leave it , it will stain. Comet or Ajax helps clean it. It will stain fabric/cloth. I love this shampoo and maintain a strawberry blonde with it. It keeps it from fading.