The black bus electrode of plasma display panel is formed from a conductive composition comprising a conductive powder, glass powder, organic binder, organic solvent, and black pigment, wherein the conductive powder comprises an alloy of at least two metals selected from the group of Ru, Rh, Pd, Ag, Os, Ir, Pt and Au. The helmet includes a jaw shield that is detachable from a head portion. The reduction may further be performed in less than 20 ms.