* Underlying Warm Tones: Dark brown hair naturally contains a lot of warm (red and orange) undertones. When you lighten the hair to create blonde highlights, you're essentially lifting the dark pigment to reveal these underlying warm tones.
* Oxidation: When the hair is exposed to oxygen from the air and water, it can cause the underlying warm tones to become more prominent.
* Sun Exposure: The sun can also accelerate the oxidation process, making the highlights turn orange faster.
* Hard Water: Minerals in hard water can deposit on the hair, contributing to brassiness.
* Product Buildup: Certain hair products can leave behind residue that can make the highlights look dull and orangey.
* Incomplete Lifting: If the hair isn't lifted to a light enough level during the highlighting process, it's more likely to show orange tones.
How to Prevent Orange Highlights:
* Professional Hair Colorist: A skilled colorist can properly assess your hair and use the right products and techniques to minimize brassiness. They can also use toners to neutralize unwanted orange tones.
* Toner: Toner is a product that deposits color onto the hair to neutralize unwanted tones. Using a purple or blue-toned toner can help counteract orange and brassy tones.
* Purple Shampoo: Purple shampoo contains purple pigment that helps to neutralize yellow and orange tones. Use it 1-2 times a week, but be careful not to overuse it, as it can sometimes make the hair look dull.
* Blue Shampoo/Conditioner: Similar to purple shampoo, blue shampoo and conditioner are designed to neutralize orange tones specifically.
* Limit Heat Styling: Excessive heat styling can damage the hair and make it more prone to brassiness.
* Protect from the Sun: Wear a hat or use a hair product with UV protection when spending time in the sun.
* Use a Water Filter: If you have hard water, consider installing a shower filter to remove minerals that can contribute to brassiness.
* Use Color-Safe Products: Use shampoos and conditioners that are specifically formulated for color-treated hair.
* Regular Touch-Ups: Regular touch-ups with a colorist can help to keep the highlights looking fresh and prevent brassiness from developing.