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I have a bag of titanium dioxide of pigment quality, unknown source. I am curious to know if the manufacturing process of titanium dioxide makes it likely that it contains any toxic by products / impurities.

Would it for example be safe to use pigment grade titanium dioxide to manufacture sunblock?

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According to the MSDS for titanium dioxide, the substance itself is suspected of causing cancer. See, for example, this link.

My opinion is that, in general, it's not a good idea to use reagents from unknown sources for any purpose, especially something like sunblock.

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