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Ash blond highlights are awesome, if you're looking for neutral or icy-blond highlights. The problem with ash, though, is it can turn on you and morph into a grayish or green-tinted monster at times. If your ash highlights turned a funky shade, you can take that ghoulish hue out of them with the right corrective hair color.
1.
Head to your local beauty supply store and purchase a warm-based semi-permanent hair color one level lighter than the ash-blond highlights you currently have. You'll also need a bottle of 10-volume developer.
2.
Mix up the semi-permanent hair color and developer in a color bottle; screw the lid on the bottle. Slip on your latex gloves to keep the color off your pretty hands. Place your index finger over the opening of the lid's nozzle. Now shake that bottle, baby, until the color and developer are well mixed.
3.
Apply the color all over your hair. Be generous and really work that color into all your hair with your gloved hands. The better the color penetrates, the more evenly it will tone your ash highlights.
4.
Set a timer for 20 minutes and let those warm tones take the chill out of your ash-blond highlights. When the time has elapsed, rinse the color out, slather on some conditioner and rinse again. Now go admire your yummy new highlights.
If you want to neutralize greenish tones in your highlights choose a red-based color. If you need to neutralize blueish-gray tones you'll want an orange-based color.
Hair colors will "stack" on top of each other and appear darker when you put one hair color over another. That's why you need to choose a corrective color that is slightly lighter than what you have now, or you risk muting your highlights out of existence.