To {HEAD ~ the solution} is added {TAIL ~ an ionizable halide salt}, e.g., KI, NaCl, to precipitate the dye product 
To { HEAD ~ the solution } is added { TAIL ~ an ionizable halide salt } , e.g. , KI , NaCl , to precipitate the dye product
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH