This product will give you an intense black color. In order to get the perfect shade, you have to follow the instructions precisely; if you do not follow the instruction, then it might be possible that you do not get your desired shade. This product is not damaging at all. It will help you to improve the overall look of your hair. You do not have to worry about the duration till which the color lasts, but after the certain, you can notice that your color is as fresh as new.