present invention such compositions often also comprise isomers of the thiophosphorus compounds as well alternatively or additionally the phosphorus based compound may be a thiophosphinic acid these compounds correspond to formula 1 wherein each of r 1 and r 2 is r 3 och 2 ch 2 n with r 1 preferably but not necessarily being the same as r 2 one x most preferably the x double bonded to the phosphorus is sulfur and the other x is sulfur or oxygen most preferably sulfur r 3 is an alkyl group of about 6 to about 18 carbon atoms and n is an integer from 0 to about 12 preferred identities and ranges of the variables are as discussed hereinabove with respect to the alkyl dithiophosphoric acids thiophosphinic acids are known and certain forms are commercially available yet another form of the thiophosphorus compounds is a thiophosphonic acid corresponding to formula 1 wherein r 1 is r 3 och 2 ch 2 n r 2 is xh one x most preferably the x double bonded to the phosphorus is sulfur and each other x is sulfur or oxygen most preferably sulfur r 3 is an alkyl group of about 6 to about 18 carbon atoms and n is an integer from 0 to about 12 again preferred identities and ranges of the variables are as discussed with respect to the alkyl dithiophosphoric acids the salts and alkyl and aryl esters.