I used poseiden and violet dream together and the color(s) are beautiful! At first I had blue on top and violet on bottom, then when I redid my roots I just added the violet all over, including on top of the blue, and it came out beautifully! I had the color in for a month and wash my hair 1-2 times a week and the colors were still very vibrant! The color is only light on the bottom because I added a little bleach over the color to get multiple shades and colors! I get so many compliments on my hair!