I've used this in a few of the brown shades before - some reddish browns, and I think one was a violet-brown. These are nice for a very temporary color, or to cover up coloring mistakes. If you highlight your hair and it comes out uneven or brassy, putting one of these semi-permanents on top will help even things out, for example. It doesn't really cover gray, or at least it didn't cover mine for very long. They don't damage hair and they are fairly easy to use. Make sure you wear gloves and protect your bathroom because it's pretty drippy.