Which is used as autocatalyst

Addition of a few crystals of MnSO4 greatly accelerates the reduction by oxalic acid of purple KMnO4 to nearly colourless manganese (II). When no manganese (II) ion is added, the reaction initially proceeds slowly, but the rate gradually increases because the product manganese (II) auto catalyst the reaction.5H2C2O4+2KMnO4+3H2SO4⟶                            2MnSO4+K2SO4+10CO2+8H2O