* Semi-permanent dye doesn't penetrate the hair shaft: Unlike permanent dye, semi-permanent dye sits on the outer layer of the hair. This means it doesn't change your natural hair color permanently.
* Gradual fading: Semi-permanent dye will fade with each wash, and the rate of fading depends on factors like the quality of the dye, your hair type, and how often you wash your hair.
* Slight staining: It's possible that some pigment from the dark brown dye might deposit into your hair, leading to a slightly darker shade than your natural blonde even after the dye has faded completely.
Here are a few things to keep in mind:
* The lighter your natural hair color, the more likely it is to show a slightly darker shade after the semi-permanent dye fades. This is because there's less pigment in blonde hair for the dye to cover up.
* The quality of the dye will also play a role. Higher-quality semi-permanent dyes tend to fade more evenly and leave less staining.
* Wash your hair with cool water: This helps to minimize fading and keep the dye from washing out too quickly.
Overall, you can expect the dark brown semi-permanent dye to wash out completely over time, but your blonde hair might be slightly darker than its original shade. If you're concerned about this, you can always choose a lighter shade of brown or do a test strand first to see how it fades.