The apparatus, which may have a configuration similar to that of a felt tip marking pen, allows convenient use of {HEAD ~ low volatility solvents} in {TAIL ~ the catalyst solution} 
The apparatus , which may have a configuration similar to that of a felt tip marking pen , allows convenient use of { HEAD ~ low volatility solvents } in { TAIL ~ the catalyst solution }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL