It depends on your natural hair color or whatever color your hair was before you dyed it. You can think about it like adding a black tint to your hair, and as it fades that tint becomes lighter. Sometimes it can also fade with a blue tint, though, depending on the brand.
Will black hair dye cover any color?
But you can't put blonde haircolor over darker and expect it to get lighter. You would have to strip it first with bleach. But yes you can cover blonde, red, brown etc with black hair dye. Just not the other extreme.
How long does permanent black hair dye stay in hair?
6-12 weeks
How long does permanent hair dye last? It's common for permanent hair colour to last 6-12 weeks, depending on the condition of your hair when it was dyed, how often you wash it, and the kind of shampoo and conditioner you use.
What cancels out black hair dye?
To expel the black pigment out of your hair, Ashley notes that you can either use straight-up color remover to strip the hair color (like Color Oops Hair Color Remover: $11.99) or a bleach to remove and lift. In many cases, both will be used together to get your mane back to sunnier days most effectively.
Will black hair dye eventually fade?
The black color molecules can then bind to the natural pigment, creating a permanent change. One misconception about permanent color is that it won't fade. Any color deposited into the hair will eventually fade, including black.
Will black hair dye turn brown?
"Color will not remove color, meaning you cannot just put a brown color on top of [dyed] black and it will magically turn brown," Lee explains. "You have to use a color remover or lightener first to remove the black, then layer on top of a brown color."