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Iron(III) chloride, generically called ferric chloride, is an industrial scale commodity chemical compound, with the formula FeCl<sub>3</sub>. The colour of iron(III) chloride crystals depends on the viewing angle: by reflected light the crystals appear dark green, but by transmitted light they appear purple-red. Iron(III) chloride is deliquescent, fuming in moist air due to the evolution of HCl, which hydrates, giving a mist.