Paraformaldehyde can also be used if {HEAD ~ sufficient water} is added to the reaction to maintain {TAIL ~ all or a substantial portion} of the curative in solution 
Paraformaldehyde can also be used if { HEAD ~ sufficient water } is added to the reaction to maintain { TAIL ~ all or a substantial portion } of the curative in solution
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH