silver recovery processor waste

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Up for bid is a eight pound bag of black powder from a photo silver recovery machine , when I purchased the unit it was loaded top and bottom with this black powder all inside of it . I am guessing that the price of silver was so low at the time they did not bother to clean the machine as often as they should have , the round drum was full of black crystals and the bottom of that plastic reservoir was thick with the same black powder , which probably overflowed into the bottom reservoir . So here is around eight pounds of material that has some silver in it , how much ? I am not sure , this is not my forte. Absolutely no returns accepted .Take a look at the pictures I provided and see the amount of silver recovered from a couple of tablespoons , it was done with the Nitric acid method on You-TUBE .