Answer:
Hello Diane,
If you are using a non-permanent hair color that has some sort of developer to mix it with, it is considered a Demi Permanent hair color. Which will last up to 4 to 6 weeks. You will still see some residue of the color after 6 weeks. Semi permanent hair color is just straight out of the bottle which uses no developer and only last a few washings.
That said, to answer your question, if you can use a permanent hair color over a semi or demi hair color, the answer is yes. However it is never a good idea to bring the permanent hair color over the mid shaft to ends more than once. This will give you ammonia burns on the hair making it dry and unmanageable. It will also make the hair fade faster because of pulling thru color will cause your hair to become more porous. By the hair becoming more porous the hair could also take color much darker on the ends.
Cal Martini
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