Naked Tan's Darkest Solution! Naked Tan recommends using the Ultra Dark solution with 16% DHA for the darkest mediterranean bronze colour, up to 6 shades darker. All our solutions are made with a combination of the most natural tanning ingredients and contain no nanoparticles, no parabens, no SLS sulphates and no alcohol. Violet based tan. Fast-drying formula. Will achieve a tan 6 shades darker. Wash n wear in only 2 hours.