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A comment on Caffenol: Developing Photos with Coffee and Vitamin C [video]. Parent comment

Re:Caffenol: Developing Photos with Coffee and Vitamin C [vi... by parshimers on Tuesday July 07, 2020 @05:31PM (#23764329)
Yes, but once it becomes laden with powdered, precipitated silver it is far less benign. Silver is still a heavy metal after all, even if it is not the most acutely dangerous one.
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Re:Caffenol: Developing Photos with Coffee and Vitamin C [vi... by foobar1962 on Tuesday July 07, 2020 @06:35PM (#23764959)
The problem then is the dissolved silver, not the thiosulphate.
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Re:Caffenol: Developing Photos with Coffee and Vitamin C [vi... by namibj on Tuesday July 07, 2020 @08:02PM (#23765662)
And just evaporating it down should be a suitable concentration step, if not just electroplating the silver out of solution with a graphite anode or something like that.
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