Can darken in the presence of iron.
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There is also some evidence to suggest that exposure to titanium dioxide nanoparticles may be harmful or toxic to the environment, including aquatic life and other organisms. The production and disposal of the mineral may also release pollutants, such as carbon dioxide and sulfur dioxide, into the air and water.
Titanium dioxide is used in an enormous range of food products, which can feel jarring when looking at some of its other uses.
Preparation of Lithopone: