Classic Shocking Blue Blue This shade glows under a

This shade glows under a black light

For the most vivid results

so we recommend using Cotton Candy Pink on hair that's been lightened to a very light level 9 blonde

Ultra Violet is a super cool

Classic Shocking Blue Blue This shade glows under aShocking Blue is a dark cobalt blue hair dye. For best results, we recommend lightening hair to a very light cool toned level 9 blonde or lighter. All semi permanent blue hair colours can interact with yellow tones in bleached hair to create a green tint so make sure to do a strand test prior to applying all over to ensure you get the results you want! If you'd like to avoid a possible green undertone, you can add in a purple shade like Purple Haze to