[Alt-photo] Dichromates and Septic System?

Darkrooms, Department of Art darkroommanager at cornell.edu
Thu Feb 15 15:48:25 UTC 2018

Hi David,

Could you describe your process for doing this? Do you use certain amounts?

Thank you,
Jennifer Gioffre
Art and Photography Studio Manager
College of Architecture Art and Planning
Cornell University
102a Tjaden Hall 
Ithaca, NY 14853
t.  607-255-4207
f.  607-255-3462
Jmg393 at cornell.edu
Darkroommanager at cornell.edu
AAPstore at cornell.edu
On 2/15/18, 8:55 AM, "Alt-photo-process-list on behalf of David Robertson via Alt-photo-process-list" <alt-photo-process-list-bounces at lists.altphotolist.org on behalf of alt-photo-process-list at lists.altphotolist.org> wrote:

    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!
    > _______________________________________________
    > Alt-photo-process-list | altphotolist.org
    Alt-photo-process-list | altphotolist.org

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