Food additive titanium dioxide likely has more toxic effects than thought, study finds

[patphil]

3. It's a bright white, opaque pigment.

I'm not a food chemist, but having worked as a chemist in the pharmaceutical industry for decades, I certainly don't recommend it be used in any way that results in ingestion.
There's no way this breaks down in the body, and the potential for negative interactions with the digestive system seems to me to be a strong possibility.
It's the nanoparticle aspect of titanium dioxide that concerns me. I see the potential for it to be persistent in the body; lodging into various organs.
I'm a strong believer in maintaining food purity. Non-food substances shouldn't be used unless absolutely necessary.
Unfortunately, too many non-food additives are there for reasons like cosmetics, mouth feel, or other reasons that have nothing to do with the food itself.