What is "CI 77492" and what is its purpose?

CI 77492 is a yellow iron oxide. It imparts a yellow colour to foundations. To achieve different shades, it should be mixed with red and black iron oxides. Chemically speaking, CI 77492 is a ferric oxide. It can range from a light lemon shade to an orange-yellow, depending on the manufacturing conditions.

Iron oxides are available in three basic shades:

• Red Iron Oxide (CI 77491): It is derived from hematite, a common mineral;

• Black Iron Oxide (CI 77499): It is produced from a mineral, magnetite;

• Yellow Iron Oxide (CI 77492): It is derived from limonites.

Generally, the iron oxides used in skincare are synthetic. Besides their use in skincare, they can also be found in coatings, paints, and coloured concretes.

Similar to other iron oxides, CI 77492 is regulated by the FDA (Food and Drug Administration), which stipulates that the production of synthetic iron oxides is carried out in various ways:

• Through the thermal decomposition of iron salts;

• By precipitation;

• By reduction of organic ingredients through iron.

The level of impurities varies between synthetic and natural forms of iron oxides. It is recommended to favour synthetic iron oxides, which are considered safe.