I bought two boxes of light blonde hair dye and it only took on my roots. My hair looks ridiculous now. Can I try again tomorrow and put more of the dye on the length of my hair for a period of time and then add to the roots when they are the same color to achieve the color I want?
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If your hair and scalp are in very good condition, then, yes, you could reapply the same color again tomorrow (to the shaft and ends for most of the development time and then to the roots).
If the light blond you applied did not change the color of the hair shaft and ends the first time, it will not when you apply it a second time, be it tomorrow or a month from now. Deep conditioning will not alter this fact. I'm inclined to agree with Attosa. It sounds as if you were applying the color to previously colored hair.
You will never get the shaft and ends to match the roots even with stripping off old color and then applying more. Your best bet is to employ the services of a very good color technician and settle for the best they can do.
You should wait a month before re-dyeing with permanent dye. Deep-condition weekly.
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