Chromium is a metal; uses include stainless steel, leather tanning, and wood treatment. There are three principal forms; of these, hexavalent chromium (chromium VI) is of greatest concern.

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The International Agency for Research on Cancer has determined that hexavalent chromium is carcinogenic to humans, especially lung cancer resulting from worker exposure to hexavalent chromium vapors.

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The last word in ignorance is the man who says of an animal or plant: `What good is it?' If the land mechanism as a whole is good, then every part is good, whether we understand it or not. If the biota, in the course of aeons, has built something we like but do not understand, then who but a fool would discard seemingly useless parts? To keep every cog and wheel is the first precaution of intelligent tinkering.
~Aldo Leopold ~