Removing Metallic Stains from Paper Objects Using Chelating Agent EDTA.

The article reports on the use of the chelating agent ethylenediamine tetra acetic acid in removing unwanted stains and spots from paper objects. In order to be a chelating agent, a molecule must have two appropriate functional groups, each having a donor atom, having the capacity to combine a metal atom by donating a pair of electrons. It was discovered that the pH of pure cellulose paper remained neutral. No significant change after accelerated ageing at 105°C for 72 hour was found. Moreover, no change was discovered after iron staining.