Hi, I'm new to using natural dyes for my hair, I have only used Cassia once. I have jet black hair and I want to dye it into a dark brown (black indoors, but some brown highlight outside). After doing some research I thought the best thing I could do was 2/3 indigo, and 1/3 henna, but then it later said *mixture will not lighten already dark hair* so I'm not sure what other options I could have? Any suggestions?

Extra question: What is a warm black?

Thanks so much!

Jai