Add a small amount of this harmonizer to darker pigment choices to eliminate the risks of blue undertones. Mix well and tattoo over the existing blue tattoo. If the existing tattoo is a dark blue color, use this straight up. If the existing tattoo color is a very pale smudgy blue, add Grey Gone Harmonizer to lighten and increase the yellow tones. With a 20 year track record, Blue Brow/Eyeliner Harmonizer promises to neutralize the blue in conjunction with correct tattooing techniques.