Titanium dioxide
An insoluble mineral filter, and is suspended in sunscreen formulae. It protects well against UVB and UVAII, and offers little UVA I protection. It has not been linked to harm to coral. Its photoexcitation can lead to the generation of free radicals if the titanium dioxide in a formula is of an insufficient grade. At large particulate sizes, it will leave an opaque white cast on the skin. As with Zinc Oxide, the specific Titanium Dioxide used by a product will impact its method and efficacy of UV attenuation: smaller particles are more cosmetically appealing and scatter a smaller proportion of UV.