I've noticed that silver tends to precipitate as flakes in old film fixer left to sit for a couple of weeks. Has anyone here tried to recycle it? I'm not thinking of getting metallic silver, for which I have no use, but to get silver nitrate, which is rather expensive and used in small quantities in several cool alt processes. I know that you must dissolve silver in nitric acid to get silver nitrate, but pure nitric acid is nasty stuff; does anyone knows of the lowest concentration that would work? Are the flakes pure enough to be turned in sufficiently high grade silver nitrate? Are there other safety considerations? My assumption here that the silver which precipitates spontaneously will be purer than the mixed silver/iodine sludge that you get with the usual "iron sponge" trick to remove the silver from the fixer. Is this a reasonable hypothesis? I'm not trying to make anything that makes sense on a business basis, just to find a cool way to prepare some of my own chemicals.