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You can use 3% hydrogen peroxide as developer and it works great. This dye works great. The reason for 3 stars is that rather than a natural "brown" this is definitely leaning more towards a sort of a soft natural "black". Slightly confusing because the prepared dye mixture is brown in my little mixing bowl, but I left it on for 3 minutes (being cautious) and my brows are now soft black. 🤷♀️ It's not the worst look, not what I was going for and slightly odd looking with my red hair, but it's not like I cant go to work on Monday either.
I really can't say how I like the results of the product. What I want to say is that the color is certainly not as dark and as "natural brown" as I need it to be. Upon opening the product, I saw that this is more of a medium-orangey brown color, perhaps lighter. I am a brown gal and that certainly won't work for my dark brown brows. I will mix this color with black in hopes of obtaining a more natural brown shade.