[alt-photo] Re: Gum solution help needed

[Philippe Berger]

Also for me, the gum solution is perfect and without problem after 1 year 
ago

Philippe Berger
mineurdecharbon at skynet.be
http://www.philippeberger.net/
----- Original Message ----- 
From: "John Brewer" <john at johnbrewerphotography.com>
To: "'The alternative photographic processes mailing list'" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Sunday, August 08, 2010 3:52 PM
Subject: [alt-photo] Re: Gum solution help needed


I mix up 1 litre at a time and that lasts about two years plus and I've 
never had any problems. Obviously it is kept in a sealed jar.

J.

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org 
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of 
Loris Medici
Sent: 08 August 2010 14:47
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: Gum solution help needed

  FWIW, formalin indeed preserve the gum solution, BUT, you have to use
it up relatively quickly: Formalin will evaporate slowly, to the point
of not being able to protect your solution - especially true in case
there's a little remainder solution in a large container. At least
that's my experience...

Therefore, my preference is towards dry / soluble preservators. I
personally use sodium benzoate, but aspirin looks definitely very
interesting - especially for people who don't want to purchase / stock
an extra chemical (such as thymol + alcohol or sodium benzoate or the
dangerous mercuric chloride) in order to preserve their gum solutions.
(E.g. students, workshop participants et. al. ...)

Thanks Philippe.

Regards,
Loris.


08.08.2010 15:35, John Brewer yazmış:
> I use 15ml formaldehyde to 1 litre of gum.
>
> J.
>
> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf 
> Of
> henk thijs
> Sent: 08 August 2010 13:29
> To: The alternative photographic processes mailing list
> Subject: [alt-photo] Re: Gum solution help needed
>
> Just wondering about Philippes suggestion: an aspirine i.s.o. formaldehyde
> or equivalent.
> If so, how much? Is one 500 mg tablet enough for one liter gum?

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