I just responded to your comment on Youtube, where I said both copper metal as well as ascorbic acid will work.
But really, I think the metabisulfites are worth the buy. They are such a useful chemical, espically in cleanup of metals such as Cr(VI). I tried
extracting ascorbic acid from vitamin C tablets as well as using the tablets directly, but the orange colouring turned it into a nightmare. The
reduction with it also seemes really slow and incomplete, but with sulfite it was a breeze. |