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