Here's why:
* No Peroxide: Semi-permanent dyes do not contain peroxide, which is the ingredient that lifts and permanently changes your natural hair color.
* Coat the Hair: Instead, they deposit color pigments that coat the hair shaft, like a temporary tint.
* Gradual Fading: Over time, the color will gradually fade with each shampoo, typically lasting for 6 to 28 washes depending on the brand, color, and your hair type.
* Factors Affecting Fade: Washing frequency, water temperature, hair porosity, and even sunlight can affect how quickly the color fades.
Important Note:
* Some semi-permanent dyes can stain lighter hair more intensely and last longer.
* If you're unsure about the longevity of a specific product, always read the instructions carefully and consult with a hair professional.
Let me know if you have more questions!