“Partially thickened” means that the coating is in {HEAD ~ a state} between {TAIL ~ the two forms} in which retains a measure of malleability 
between
“ Partially thickened ” means that the coating is in { HEAD ~ a state } between { TAIL ~ the two forms } in which retains a measure of malleability
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH