Why do sensor anodes over time assume different colors?
Lead oxides have different forms. Different lead oxides have different colors For instance Pb2O3 is reddish and purple. Green is PbO is greenish. Pb3O4 is black, or green depending on crytal structure Trace amount of zinc or copper in the lead will lead to other colors also. Abs cell body may leach out small amouts of chemicals, which cause yellow. Trace carbonate will cause white colors.
