I had two griffin beakers with 200mL of used photo fix solution on magnetic stirrers ready for electrolysis only to find the power supply was not up to snuff. The backup plan was a redox reaction of Fe with Ag in solution and figure the difference of weight from the set of griffon beakers initially vs. after the reaction (dry of course). The scale had a high degree of accuracy but this otherwise crappy tool could not handle even a dry 250mL beaker. Plans changed to test tube, soon the centrifuge found its way to the table. A few of the recently purchased 15mL centrifuge tubes that were apparently not actually for centrifuges were loaded and then there were 2. I measured a whopping 2g/L... notice the lack of sig figs :P Anyway, for anyone looking for a really terrible way to measure the silver content of waste fix just follow the directions above. How do I improve the results while waiting on a new power supply?