A 2-Step application process is essential - a glossy BLACK colour can only be achieved by using Henna and Indigo individually - apply Henna first, rinse off, then apply Indigo as a second separate application. Yes, it does take twice as much time and it does use twice the amount of product but the results are fantastic - it really is the only way to achieve a long-lasting 100% natural black colour without the use of chemical dyes.