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