b) surfactant in an amount of no greater than about 5 parts by {TAIL ~ weight} per 100 parts by {HEAD ~ weight} of the microspheres, 
b ) surfactant in an amount of no greater than about 5 parts by { TAIL ~ weight } per 100 parts by { HEAD ~ weight } of the microspheres ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH