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Ceramic made from alumina poisonous?

I was searching for ceramic knife and learned they can be made from Zirconia or Alumina. Some cheap ones could be from the latter because material is cheaper. Isn't Aluminum Oxide poisonous to human ...
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Why did my ceramic coated loaf pan turn brown?

I used ceramic a coated loaf pan and the inside color which was white, changed to brown, as if it has burnt, is that normal?