The first time I ordered henna I got indigo too intending to do a treatment with both. But I never used the indigo because other than the gray you can't tell I dye my hair. Still reddish brown like before. Plus I do add coffee/black tea which is recommended by Henna Sooq to get more brown than red.
"A life without fame can be a good life, but fame without a life is no life at all." - Clive Davis