* Type of Dye:
* Permanent Dye: This dye penetrates the hair shaft and chemically alters the hair's color. It doesn't truly "wash out." Instead, it fades over time as the color molecules break down from washing, sun exposure, and heat styling. The fading process can take several weeks to months. If you want to remove permanent highlights, you'll likely need to use color removers, bleach, or other chemical treatments.
* Semi-Permanent Dye: This type of dye coats the hair shaft and gradually washes out with each shampoo. Semi-permanent highlights can last anywhere from 6 to 8 washes, depending on the hair's porosity and the dye's formulation.
* Demi-Permanent Dye: Demi-permanent dye is a mix between semi-permanent and permanent. It penetrates the hair shaft slightly but doesn't cause as much damage as permanent dye. Demi-permanent highlights can last up to 24 washes.
* Hair Porosity:
* Porous Hair: Porous hair has a more open cuticle layer, which means it absorbs dye quickly but also loses it faster. Highlights on porous hair might fade more quickly than on less porous hair.
* Low Porosity Hair: Hair with low porosity has a tightly closed cuticle layer. It can be harder for the dye to penetrate initially, but the color may also last longer.
* Hair Color: The starting hair color will also impact the result as well as how noticeable the highlights are. Darker hair is harder to lift and maintain while highlights appear more drastic on dark hair vs blonde hair.
* Aftercare:
* Washing Frequency: Frequent washing will cause the color to fade faster.
* Shampoo Type: Harsh shampoos, especially those containing sulfates, can strip the hair of color. Using color-safe shampoos can help prolong the life of your highlights.
* Heat Styling: Excessive heat from styling tools can damage the hair and cause the color to fade more quickly.
* Sun Exposure: UV rays can fade hair color. Using hair products with UV protection can help prevent this.
* Color Correction: Dark dye is needed to neutralize lighter colors in the hair, and is hard to strip to return to the initial color of the hair.
How to Help Fade Highlights:
* Wash Hair More Frequently: Using a clarifying shampoo (but not too often, as it can be drying) can help strip the color.
* Use Hot Water: Hot water opens the hair cuticle and can release dye.
* Spend Time in the Sun: Natural sunlight can fade hair color.
* Swim: Chlorine and saltwater can both fade hair color.
If you want to completely remove permanent highlights, consult a professional stylist. Trying to do it yourself can damage your hair or result in unwanted tones.