Good Dye Young Semi-Permanent Hair Colour Narwhal is a teal hair dye that uses salon-quality colour that does not damage hair and lasts 7-24 washes This teal blue hair dye is perfect for money pieces, buzzcuts, bangs, dip-dyes, and more. Narwhal is the most vibrant teal shade with light green undertones. This blur hair colour is super conditioning with high-quality cream base and is most vivid on level 9 hair. An almost mythical shade of teal hair colour that is too good to be blue!