I have had henna on my roots for about 3 hours. I also want to refresh the color on the rest, so will apply the henna there for a bit. Henna slowly fades on my hair. About how long should I leave it on my length for this? Since it's time to apply it now,I'll probably leave it for about an hour, but I'm curious what others do. My mix is only about 15% henna, the rest cassia.
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