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  2. Chromium - Wikipedia

    en.wikipedia.org/wiki/Chromium

    The use of dichromate cleaning solutions is now phased out due to the high toxicity and environmental concerns. Modern cleaning solutions are highly effective and chromium free. [97] Potassium dichromate is a chemical reagent, used as a titrating agent. [98] Chromates are added to drilling muds to prevent corrosion of steel under wet conditions ...