I have a slightly complicated hair situation - it's naturally dark brown (and long), then had a lot of foils, then I used henna + indigo for a year and also I've got quite a few greys! It was getting way too dark with the repeated henna + indigo-ing so I spent ages trying to find an option to colour over it. There were plenty of horror stories to read on the internet, and hairdressers were also reluctant to provide much advice other than to avoid the grocery store box dyes because apparently you can get some bizarre results. I found The Shade during my internet searches, and was initially worried about whether the henna/indigo would react with the hydrogen peroxide but in the end gave it a go because it was ammonia free and sounded like higher quality dye than the supermarket dyes. I went for the golden brown - I probably left it on too long at the hairline roots so it intially came out a bit more red than expected (though this has faded nicely with a couple of washes) and in the areas where the colour was on for less time it looked really nice. It's covered the greys well and hasn't done anything weird with the henna-treated midlengths. I think I still have a way to go as now my roots are lighter, the mid lengths have remained very dark (I don't think there's much I can do about that other than grow it out) and the ends are lighter again from the old foils, but I think given my hair circumstances it's the best it could have turned out! And I'll definitely be continuing to use until I finally grow out that dastardly henna & indigo :-) Thanks The Shade!