Lead matte, high density, soft, easily formatted, sponge, the bluish white conductivity is a low metal. This metal is corrosion-resistant and is used to store corrosive liquids due to this feature (for example sulfuric acid). Lead can be hardened by alloy with antimon or other metals. A common misconception is that the lead element has a zero Thomson effect (electric current-heat ratio). The bullet has a low but non-zero Thomson coefficient. All lead isotopes other than Pb204 isotopes are caused by a complex radioactive reaction.