I didn’t believe it could work on my black eyebrows but it actually worked, especially I left it for 6 minutes instead of 3-4
4-5 minutes is definitely not enough unless you already have light brows. Since I have black brows, I had to leave it on for 2+ hours while sometimes reapplying (I wiped it off at least once before reapplying over the whole brow again), but i'm used to having to leave bleach on my roots for much longer than typical because my hair is too stronk. I'm pretty satisfied with the results. It did what I needed it to do, and it's gentle enough not to burn my sensitive skin, but because of that I suggest leaving it on longer while keeping an eye on it every so often and touching up as necessary.
The media could not be loaded. Super easy to use and quick processing time. If you leave it on too long they will definitely turn brassy but I am really happy with the product.