Ultra Violet Semi-Permanent Hair Colours Ultra by name, ultra by nature. An intense purple colour with blue undertones made for the bold and the brave. For the most vivid results, we recommend applying to pre-lightened hair. The colour on the pot is a simulation of the colour on a level 10. Soft, silky hair never goes out of style. That’s why all our colours contain a conditioning formula that nourishes hair from first application.