Instruct: Classify a review as either positive or negative.
Query: totally works!!!! just leave it on for 20 mins!

i've been using this for a long time, i wouldnt say it drastically changes the colour of your hair, but in the sun, my black hair used to look a bit brownish, but now it looks totally black!! the only thing is it says to leave it on for 2-5 mins, but what you should do is step out of the shower and leave it on for 20 minutes. also, it smells a bit, but the smell doesnt stay long at all. and you have to put a lot. note however, that i dont use it as a daily conditioner, but use it every week for 20 mins. its AMAZING.