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The main concern with nanoparticles is that they are so tiny that they are absorbed into the skin more than we want them (ideally sunscreen should remain on the surface of the skin). Once absorbed they might form unwanted complexes with proteins and they might promote the formation of evil free radicals. But do not panic, these are concerns under investigation. A 2009 review article about the safety of nanoparticles summarizes this, to date, in-vivo and in-vitro studies have not demonstrated percutaneous penetration of nanosized particles in titanium dioxide and zinc oxide sunscreens. The English translation is, so far it looks like sunscreens with nanoparticles do stay on the surface of the skin where they should be.  

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As the demand for titanium dioxide continues to grow, so does the competition among suppliers. Companies that can produce high-quality rutile and anatase titanium dioxide at competitive prices will likely gain a significant advantage in the market. Additionally, the development of new technologies for producing titanium dioxide, such as using biomass as a raw material or implementing more sustainable production methods, could further differentiate suppliers and drive innovation in the industry.

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