I bought this to try over my medium brown hair which I usually colour red using LUSH cacas rouge. I was very pleased with the results - I was left with a very pretty red wine/garnet colour with lots of shine! I'd ordered 3 bottles as my hair is long (almost to the, er, top of my bottom!) but I only needed 1 bottle to do all my hair! Brilliant value for money.
Be warned though - THIS PRODUCT STAINS!!!!
I've since used henna on my hair again with no problems. I'd recommend this product to anyone wanting to use a hair colour without peroxide.