Review (5/5): Here's a few tips...
First off, I would recommend leaving the bleach in for at LEAST a half hour, and if your hair is even the slightest bit brown, leave in for about 40 minutes or more. I had dyed mine dark brown previously so I left it in for an hour. The longer you leave the color in, the more vibrant it will be. If you leave it in for the minimum time, it will look more blond. Also, if your hair is long, use ALL of the bottle. I would a little bit of bleach handy to wipe up the color from surfaces, as it will drip. Or, cover everything in newspapers or old towels. Make sure that you rinse the color out completely, and keep rinsing even when the water does run clear. I have gotten stains on pillows and blankets from not washing it out enough. Also, it would be better to buy color protecting shampoo/conditioner, as it will stay in longer. Overall, if you follow all the directions and use the tips I listed above, you will get a long-lasting, vibrant color.