GUILT-FREE GLAMOUR!® Blue Panther is a rich, deep violet-blue hair dye with cool blue/purple undertones. For best results, use this dark, velvety shade on pre-lightened hair! Please note that since Blue Panther is so pigmented, it should work well on most hair levels but due to its blue undertone, it can clash with very orangey base tones on virgin, unbleached hair! Blue Panther can also be added into lighter colors like Amethyst Ashes to punch up their vibrancy and staying power! All semipermanent dyes work best on pre-lightened hair. Always do a strand test to make sure the color works well for your base color! Not sure? Reach out to customer service at customerservice@manicpanic.