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