I used 1 step. 2 step is too troublesome and time consuming. I agree that it is a colour mixing game. This time the proportion for indigo and henna is 2/3 and 1/3 respectively. I may also try to reduce the proportion of indigo next time to see the result. red + blue = purple. Personally, I like purple, but cannot get it with Henna. Although I never heard anyone can get purple with mix of henna and indigo, it's no harm to try.