Chelating agents and methods relating thereto

A method of bleaching comprising:

• providing a bleaching composition comprising a peroxygen species;
• improving the stability of the bleaching composition by adding to the bleaching composition a salt comprising an acidic chelating agent comprising an amine functionality and at least 0.25 mole of an alkaline earth metal per mole of acidic protons provided by the chelating agent, wherein the acidic chelating agent is selected from the groups consisting of iminodisuccinic acid and hydroxyethyliminodiacetic acid;
• and
• contacting the bleaching composition with an object to be bleached;
• wherein the equivalent bleaching effect is achieved using a lower amount of peroxygen species than would be necessary if adding an equivalent amount of free acid or sodium salt of the chelating agent.