Oregon Esthetician State Board

Which natural coloring is often combined with iron oxide in cosmetic formulations?

1. Charcoal

2. Annatto

3. Carmine

4. Titanium dioxide

The correct answer is: Annatto

Annatto is derived from the seeds of the achiote tree and is widely used as a natural coloring agent in cosmetic formulations. Its vibrant orange and yellow hues come from carotenoids, which are pigments that not only provide color but also have antioxidant properties. When combined with iron oxide, annatto can enhance the color spectrum in cosmetics, offering a range of shades suitable for various skin tones. This combination is often preferred because both annatto and iron oxide are considered safe for topical application, and they can provide a more natural alternative to synthetic dyes. In contrast, other options like charcoal are primarily known for their detoxifying properties rather than being used as a coloring agent. Carmine is a red pigment derived from cochineal insects and doesn't typically combine with iron oxide in formulations, and titanium dioxide is mainly used as a white pigment and sunscreen ingredient rather than a color enhancer. This context underscores why annatto stands out as a natural coloring agent often paired with iron oxide in cosmetic products.