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27th
Microfilm Recycling Process
“According to state and federal regulations, any solution containing greater than 5 parts per million (ppm) of silver must be collected and handled as hazardous waste.
CRE utilizes a chemical enzyme process to recover silver from the film base. The film base, polyethylene terephyhalate, or PET, is first chopped into tiny pieces three-quarters or an inch or smaller, then put into 10,000-gallon enzyme reactor tanks where the silver is removed from the base.”
http://www.mercercoeda.com/view-news.php?id=971
research into a lead from Zeke