Most of the iron oxides available are synthetically produced, due to FDA regulations that strictly prohibit the use of natural iron oxides in cosmetics. This is an issue of purity, and natural iron oxides are more likely to contain high levels of impurities than synthetic versions. When red iron oxide is blended with titanium dioxide, a rosy pink color is achieved. Ultramarines Ultramarines are made synthetically by heating a mixture of kaolin clay, sodium carbonate, sulfur, silica, carbon, and resin to very high temperatures. The FDA has approved their use in cosmetics and toiletries.
Ultramarines are insoluble in water.
Incorporate into raw soap before pouring into molds or into the hot lye solution. Robin's Egg Blue - 1 teaspoon per 8 pounds soap. Use an oil base that will create a white soap. Always Test Test Test. Please order the cosmetic grade pigments and clays that you need from the Online Store Front .