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