OCR Text |
Show Recover Silver From Films of the "Movies" ITow one of the large Hollywood motion picture laboratories ha turned Ita tank of old developing solution Into a silver mine yielding $(1,000 s month Is told by the government bureau of standard. The emulsion on undeveloped (lira consists largely of silver, associated with bromine to form silver bromide. When developed, the silver bromide thnt hns been exposed to light changes to metallic silver. In the fixing ha III, the unchanged silver bromide Is dissolved out, leaving clear space where the Dim was In darkness. Every pound of silver bromide contains con-tains more than nine ounces of silver. Though miles of II I m are run through the solutions weekly, and they contain con-tain large quantities of silver, they were formerly thrown Into the sewer when their power was exhausted. Now, by s simple chemical process, the all- ver Is recovered, and sold to the United Unit-ed States mint at San Francisco, Old film Is also burned to recover the all ver and sometimes yields as much as $1,000 worth of silver a month In addition. |