Fire Opal Semi-Permanent Hair Colours A beautiful spiced copper shade that glows with natural molten warmth, Fire Opal is sophisticated, multi-dimensional and full of life. 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. Our Rich Naturals range delivers even coverage and contains a deep-conditioning formula that nourishes hair from the first application.