Organic colors (lakes and dyes) are synthetic, chemically very complex molecules and are divided into various groups including indigoids, xanthenes, azos, nitros and others. As compared to inorganic colors, organic colors are available in a larger variety of shades. Since most organic pigments are soluble (either water or oil soluble), they can be utilized not only in solid makeup products (e.g. lipsticks), but also in aqueous products (e.g. nail lacquer, liquid makeups). Since certain organic pigments can be irritant to mucous membranes, all organic pigments must be approved and certified by the FDA.