{TAIL ~ Para aminophenylacetic acid} and {HEAD ~ 4 aminoantipyrine} can be added to the bath and in the presence of sodium ferrocyanide reduce the rate of oxidation of the bivalent tin ion 
{ TAIL ~ Para aminophenylacetic acid } and { HEAD ~ 4 aminoantipyrine } can be added to the bath and in the presence of sodium ferrocyanide reduce the rate of oxidation of the bivalent tin ion
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH