Cream Formula for Semi-Permanent Hair Colour. Vegan Friendly & Cruelty Free!Alien Grey is a cool, medium slate gray hair dye. For the most out-of-this-world results, lighten your hair to the lightest level 10 blonde before use. Alien Grey can also create cool tones in virgin, unbleached hair. Alien Grey is also the perfect background shade for the popular prism hair effect movement or as a mix-in to make smoky versions of your favourite Manic Panic semi-permanent hair colors. Style: Classic Semi-Permanent Hair Dye Colour: Alien Grey Colour Description – Slate Grey Additional Features: Benefits of Conditioning Hair, Resealable Tub For Longer Use, Comes With Instructions Duration: 4 – 6 weeks