EDTA Acid

Ethylene diamine tetra acetic acid or EDTA is an amino-poly carboxylic acid. EDTA is a colourless to whitish powder that is readily water-soluble. EDTA is widely used for dissolving lime scale deposits or as a chelating agent i.e., its ability to "sequester" the metal ions such as Calcium and Ferric.
In industry, EDTA is mainly used for the sequestering of metal ions in aqueous solution. In the textile industry, it aids in the prevention of metal ion impurities from modifying colors of dyed products. EDTA is added to some food as a preservative or stabilizer to prevent catalytic oxidative decoloration, which is catalyzed by metal ions. In the pulp and paper industry, EDTA inhibits the ability of metal ions, especially Mn2+, from catalyzing the disproportionation of hydrogen peroxide, which is used in "chlorine-free bleaching."