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