I used Stargazers Hot Red on my little sisters hair, which is thick and long (down to her middle back)! I only needed one and a half bottle to cover it so there is a lot of dye to work with! Also, the colour came out RED (on pre-bleached orange hair). Great red colour, couldn't be nicer! The colour faded into a pinky red, and it lasted for about 2-3 weeks (two without fading). Highly recommended if your looking for a cool and RED haircolour!
(Emailed Review from Josefine)