You can dye your hair with henna and indigo every seven days or every fifteen, or even more often if you like. The only thing you should keep in mind is that each time you dye your hair with henna and indigo your hair becomes darker.
To avoid too much darkness, you can put henna-indigo mixture on your hair roots. Indigo fades faster than henna. The more often you use henna, the darker your hair will be. If you do not want it to become too dark, use henna on roots only.
If your natural hair color is white and use henna for the first time, it will become orange. If you use it again, it will become dark orange. If you repeat it, one more, it will become almost brown. You can repeat it as long as you wish.
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