have anybody tried shea moisture hair color system?

my hair is 3b, and dyed black from like two months ago or so, ive been trying to avoid chemical stuff. i could tell the difference in my hair now but im struggling to accept my grey roots & im only 27 yrs old! so ive been thinking about henna, but may be not for me since its in red colors. i used to dye with garnier nutrisse nourishing color foam.. i just found this shea moisture hair color system, wondering about anybody with experiences trying this one?  i also thinkin about bigen semi permament just for root touch up instead of dying whole hair. so any advice on hair coloring?

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