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Chromium(III) oxide (Cr2O3) is used for industrial applications such as catalysts and pigments. In the classical form, namely the fine particle, Cr2O3 is insoluble and chemically stable. It is classified as a low‐toxicity chromium compound. Recently, industrial application of nanoparticles (a new form composed of small particles with a diameter of ≤100 nm, in at least one dimension) has been increasing...
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