12 AM is a mysterious midnight blue shade that goes well with anything. The blue fades true to colour, before it becomes silverish grey and ends off in a cool-toned blonde. 12 AM will leave a subtle tint of blue on darker levels of hair but it looks most vibrant on pre-lightened level 8 hair (refer to listing images). 12 AM would look a bit greenish if there is existing yellow tones in your hair.