The precipitate is isolated from {HEAD ~ the fixer solution} to remove silver thereby and hence enable {TAIL ~ recycling} of the fixer solution 
to enable
The precipitate is isolated from { HEAD ~ the fixer solution } to remove silver thereby and hence enable { TAIL ~ recycling } of the fixer solution
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH