Primarily used in general industry and medicine, ethylenediaminetetraacetic acid (EDTA) is an aminopolycarboxylic acid that is both colorless and water soluble. Industrially, the major use of EDTA is dissolving limescale in boilers, and as a hexadentate ligand and chelating agent. It is also manufactured in salt form as disodium EDTA and calcium disodium EDTA. In the textile industry, EDTA is used to prevent dye colors from being altered due to metal impurity contamination. Paper manufacturers used EDTA to inhibit metal ions from catalyzing hydrogen peroxide as part of chlorine free bleaching processes, and in food as both a preservative and stabilizer. The medicinal use of EDTA is chelation therapy, specifically for treating mercury and lead poisoning due to EDTA's utility and effectiveness in isolating metal ions in aqueous solutions. Additionally, dentists and endodontists use EDTA during root canal procedures to remove inorganic debris and lubricate canals for obturation.