mixing said used fixer solution with an aqueous solution of hydrosulfide that provides 0.5 to 1.0 moles of hydrosulfide ions per mole of dissolved silver, whereby said {HEAD ~ dissolved silver} is converted to {TAIL ~ a precipitate} of silver sulfide 
mixing said used fixer solution with an aqueous solution of hydrosulfide that provides 0.5 to 1.0 moles of hydrosulfide ions per mole of dissolved silver , whereby said { HEAD ~ dissolved silver } is converted to { TAIL ~ a precipitate } of silver sulfide
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 OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH