Here's why:
* Hair color cannot lift hair color. Dyeing your hair is different than bleaching it. Dye just adds color, it doesn't remove it. So in order to make your hair lighter, you need to remove the black dye first.
* 3N is a dark shade. 3N is a dark color itself (Dark Chestnut Brown). It is not a lightening product. It can only add more dark color to your hair.
* Lifting previously dyed black hair is very difficult. Black dye is notoriously hard to remove. You would likely need to use a color remover or bleach to lighten it, which can be damaging.
What you can expect if you use 3N on dyed black hair:
* Little to no change in color. Your hair will likely remain looking black, perhaps with a slight brown tint visible in very bright light.
* Possibly a deeper, richer black. The brown undertones in the 3N might add some depth.
* Damage to your hair. Adding more dye will cause more damage.
How to lighten dyed black hair:
If you want to lighten your dyed black hair, you will need to use a different process, and I highly recommend consulting a professional hair stylist:
1. Color Remover: A color remover is the gentlest option to try first. It attempts to remove the artificial dye molecules from your hair. This may get you to a lighter shade, but likely not your desired color in one go.
2. Bleach: Bleach is the most effective way to lighten hair, but it's also the most damaging. It breaks down the melanin (natural pigment) in your hair and the artificial dye. It will require multiple sessions and a very skilled stylist to do it safely, especially on hair that's already been dyed black.
3. Highlights: To avoid having to damage all of your hair, you can highlight some pieces and get a blended brown color.
Important Considerations:
* Damage: Lightening dyed black hair can be very damaging. Be prepared to invest in deep conditioning treatments and protein masks.
* Orange/Red Tones: When lifting black dye, your hair will likely go through reddish or orange stages. A professional stylist can help you tone these out.
* Patience: Lightening dark hair is a process that takes time and patience. Don't try to do it all at once, or you risk severe damage.
In summary, Naturtint 3N will not lighten your dyed black hair. You need to use a color remover or bleach, preferably by a professional, to lighten it first.