I have really thick hair and it's brown, so using brow mascara had its limits, and I bought a dye kit for the first time! It felt a bit stinging after about 8 minutes, but after 10 minutes I thought the color wasn’t showing, so I left it on for 20 minutes. After washing it off, my skin was definitely red. But I felt the same level of irritation when dyeing before, so I guess it’s the same principle. I don’t know how much the color faded, but I was stressed about having thick eyebrows, so I’m satisfied! If it’s too dark, you have to lighten it, but if it’s light, you can just draw your eyebrows haha. Eyebrows really do make a difference in your look! I applied it thickly, but since I didn’t feel much change after 10 minutes, I guess it varies by person!