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Contact SupplierFerric chloride anhydrous, with the chemical formula FeCl3, is a dark brown, crystalline solid that is highly hygroscopic, meaning it absorbs moisture from the air. It is primarily used as a coagulant in water treatment to remove impurities and in etching processes for electronics and PCB manufacturing. This compound is corrosive and requires careful handling and storage in tightly sealed containers to prevent moisture absorption.