I've been using just cassia on my hair for years to dye my grays. For a long time, it worked great, but recently, it's not covering the gray roots as well on the back of my head. I guess I must be getting more gray there. The rest of the hair length is a nice golden light brown from the buildup of cassia (slight reddish tone).

I'm thinking about using hendigo to get rid of the grays that the cassia isn't covering as well anymore. I don't want too dark of a brown--more of a medium brown. My natural hair used to be a level 6. Although I'm fine with a warmer brown, I'd like to avoid it looking red.

I'm not planning to go back to conventional dyes, so I'm okay using indigo. I'm just nervous about getting a brown that's not too dark or too red.

I've read that I should do 50/50 henna and indigo. Should I also use some amla? Does anyone have advice for me? Should I leave the mixture on for less time (maybe an hour) to avoid my hair getting too dark?