[Alt-photo] Gum pigment mixed in batches

Francesco Fragomeni fdfragomeni at gmail.com
Tue Jan 9 05:12:27 UTC 2018

Sorry, I might have been unclear. I mean specifically mixing premixed
emulsions i.e. pre-mixed gum arabic, dichromate solution (i use 13%), and
watercolor pigment. I'm asking if I can premix the complete ready-to-coat
sensitized solution in batches.

You mention not to add the dichromate but why would that be? Does
dichromate lose sensitivity or go bad after its been mixed?

On Mon, Jan 8, 2018 at 8:54 PM, Denny <dspector at charter.net> wrote:

> Francesco,
> I routinely mix gum and pigment in large batches and I've had no problems.
> Just don't include any dichromate,  and mix well before using each time.
> Denny
> -----Original Message-----
> From: Alt-photo-process-list
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf
> Of
> Francesco Fragomeni via Alt-photo-process-list
> Sent: Monday, January 08, 2018 8:45 PM
> To: The alternative photographic processes mailing list
> Subject: [Alt-photo] Gum pigment mixed in batches
> Hi all,
> Quick question. I'm sure this has been asked but I can't find it. Can gum
> bichromate pigment be premixed in larger batches rather than being mixed at
> coating time? I'd like to mix stock pigment solutions and keep them stored
> in glass bottles that I can reach for across printing sessions (rather than
> mixing fresh for each print). Is there any reason not to do this? I think
> I've heard of people doing this but wanted to double check. Thanks!
> -Francesco
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