So I have naturally dark blond hair and got highlights a couple months ago. I've used clairol natural instincts semi permanent hair color in the past to go brunette with great results. I used a darker color than I was 'supposed' to and got a great brunette color that lasted longer than the 28 washes just lightened gradually but lasted longer because I went darker than I should've according to the box.
I'd love to do that again but I'm wondering what happens if you use a dark(ish) semi-permanent color over blond highlights? Will that totally mess things up or would I get the brunette that I'm looking for?
Thanks for any help you can give me and sorry for the long winded question!