If you used henna/cassia with metallic salts added, your hair might fall off, turn green, break off, dissolve, or have nothing bad happen. I would suggest testing the lotion on a little bit of hair first. (One great way to tell if your "henna/cassia" was pure or impure is if you had to mix it with a developer, ie, not water/household items, for it to work. If you had to do so, it is definitely not pure!) However, you can color over lightened hair, with impure henna and have no really bad side effects except for maybe a bit of damage, which would happen anyways.
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