 mixing {HEAD ~ the colorant solution} with water and {TAIL ~ an emulsifying agent} so as to obtain a colorant emulsion; and 
with
mixing { HEAD ~ the colorant solution } with water and { TAIL ~ an emulsifying agent } so as to obtain a colorant emulsion ; and
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH