In a process for treating used, photographic fixer solution having a pH of about 3.5 to 7.0 and containing from {HEAD ~ 0.74 to 1.3 moles} of {TAIL ~ spent alkali thiosulfate} therein and containing dissolved silver by the addition of a chemical reagent thereto, the improvement comprising, 
In a process for treating used , photographic fixer solution having a pH of about 3.5 to 7.0 and containing from { HEAD ~ 0.74 to 1.3 moles } of { TAIL ~ spent alkali thiosulfate } therein and containing dissolved silver by the addition of a chemical reagent thereto , the improvement comprising ,
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 HEAD HEAD 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