Here's why:
* Demi-permanent dye works differently than permanent dye. It doesn't penetrate the hair shaft as deeply. Instead, it coats the hair cuticle with color molecules that gradually fade with each wash.
* Fading takes time. Depending on the product and your hair type, the color can last anywhere from 4 to 28 washes.
* Natural hair growth plays a role. As your hair grows, the new hair will be your natural color, while the dyed hair will continue to fade.
It's important to note that:
* The fading process is gradual. You won't notice a dramatic color change overnight.
* The final result depends on your starting hair color and the shade of dye used. If you used a color close to your natural shade, the fading will be less noticeable.
* The color may not completely disappear. Even after the dye has faded significantly, there might be a slight tint or "shadow" of the color left behind.
In summary, demi-permanent dye is a great option for temporary color changes, as it fades gradually and eventually disappears, allowing your natural hair color to return.