This invention relates to {HEAD ~ the use} of {TAIL ~ a hydrosulfide reagent} to precipitate silver sulfide from spent photographic fixer solutions 
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This invention relates to { HEAD ~ the use } of { TAIL ~ a hydrosulfide reagent } to precipitate silver sulfide from spent photographic fixer solutions
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 OTH OTH