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