I hadn't re-bleached my hair to do this, i just plastered it on and left it for about 2 hours. My hands were dark blue but they didn't stain for more then about 3 days.The color is amazing. Before blue i had purple and pink. My roots are still purple and the middle of my hair is blue all around. Then the rest of my hair is natural with some tints of teal.The effect is quite amusing and this product itself is excellent. The color is still in, after 2 weeks of washing.