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