Koleston Perfect Pure Naturals The Pure Naturals colour range makes hair look its best, with brilliantly natural-looking colour and shine. With true-to-life shades and brilliant colour effects, they are perfect for the natural look. From light, shimmering blonde to silky, glossy black, these colours provide the best possible coverage for grey/white hair. Pure Naturals are perfect for those who aspire to a well-groomed, natural look and who place a particularly high value on soft, silky hair.