[Alt-photo] Dichromates and Septic System?

David Robertson david at robertson.yt
Thu Feb 15 13:54:59 UTC 2018

Adding a reducing agent like sodium sulphite (or bisulphite) would reduce the chromium to the 3+ oxidation state. Chromium (III) is much less toxic than chromium (VI). I always do this before disposing of any hexavalent chromium compounds.


> On 15 Feb 2018, at 13:46, Diana Bloomfield via Alt-photo-process-list <alt-photo-process-list at lists.altphotolist.org> wrote:
> I'm sure this question has been asked and answered before, but I can't
> locate it.  A friend who wants to learn gum printing asked about what to do
> if you have well water?  Does anyone know the answer?  I thought there was
> something you could add to a septic system that neutralizes the dichromate
> somehow??  Thanks!
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