Review (5/5): Definitely worth the buy
This was super easy to use and the dark brown shade was perfect for my medium brown hair color. It didn't have any hint of red to it, which is what I wanted. I left it on for a total of two and a half minutes, but I would suggest starting out at one minute and then building up so you don't go too dark. It didn't irritate my skin at all to reapply it to go darker. Considering what it costs to have your brows tinted professionally, this is worth it. I can't attest to how long the tint lasts as it has only been four days, but I will update.