Most of our products such as the oxides are produced to be natural identical in a laboratory. The reason for this is that a natural oxide would not fit the FDA requirement for the minimium in heavy metal contents. Soils naturally contain heavy metals so any oxide must be purified for cosmetic use. Iron oxides in nature (dirt) are often loaded with toxic metals like lead, arsenic, mercury, antimony and selenium. The FDA stepped in to regulate cosmetic colorants so the level of toxic metal present are present in such low concentrations that they are considered “safe.” In fact, only synthetically prepared iron oxides are approved for use in cosmetics in this country. Since 1970 Oxides and Ultramarines have been manufactured in labs so assure purity. The lab manufactured pigments have the same molecular structure as their natural identical.