I've been using henna for four years and have TBL hair. Initially I did three applications over full length and after that I've been doing my roots.

I'm having a bit of an issue where I have horizontal stripes in my hair where I've had different dyeing results. Sometimes I use henna from the freezer and don't get such a good dye release, twice I terped my henna and got darker results, some dye lots have been more red, some older freezer henna almost brown. It's not obvious if you look at all the hair, but is quite obvious if looking at a single strand.

Is there something you do personally to even out the color? Do you do like a yearly henna gloss over all the hair or something like that?