{HEAD ~ The process} comprises introducing {TAIL ~ a hydrosulfide reagent} into the fixer solution, which contains silver, to precipitate silver sulfide while maintaining pH and thiosulfate levels in the fixer to allow for reuse 
{ HEAD ~ The process } comprises introducing { TAIL ~ a hydrosulfide reagent } into the fixer solution , which contains silver , to precipitate silver sulfide while maintaining pH and thiosulfate levels in the fixer to allow for reuse
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH