* The type of blonde: If you have very light blonde hair, it's more likely that the brown dye will fade out more quickly and more completely. However, if your hair is a darker blonde, the brown dye may take longer to fade and may leave behind a noticeable tint.
* The type of dye: Permanent dyes are designed to last longer and will be much harder to wash out than semi-permanent or temporary dyes.
* The quality of the dye: Higher quality dyes tend to last longer and fade less quickly.
* Your hair's porosity: Porous hair (meaning it absorbs and retains moisture easily) may hold the dye for a longer time.
Here's what you can expect:
* Semi-permanent dyes will fade gradually over several washes. You'll likely notice a noticeable difference after a few washes, and the color will continue to fade until it's completely gone.
* Temporary dyes will wash out more quickly, usually after just one or two shampoos.
* Permanent dyes will fade more slowly, and you'll likely see a noticeable difference after several weeks. The color may never completely disappear, but it will become significantly lighter.
If you're unsure about how a brown dye will affect your blonde hair, it's always a good idea to consult a professional stylist. They can help you choose the right type of dye for your hair and advise you on the best way to maintain the color.