[alt-photo] Re: Gum solution help needed
trevor at chalkjockeys.com
Sun Aug 8 14:24:04 GMT 2010
Somehow, I imagine you in a wine cellar of a different sort with glass
casks instead of oak and a beaker instead of a goblet.
Philippe Berger wrote:
> ASPIRINE = ACIDE ACÃ‰TYLSALICYLIQUE
> It is esay, no dangerous and no expensive
> It is a pleasure for me to help the liste
> Attention: The old solution of Gum is very better of a new solution of
> Why ???? because a old solution of Gum is more acid and it is very
> better for the picture
> For me the best gum solution is after 3 month of prepare
> For my self, i use my best gum with old solution of Gum of 1 year ago,
> i certifie it is very very best
> Sorry for my englis but
> A old solution of gum (3 month) is the best because the acidity is
> The French Photograph Demachy use only old solution of gum
> Best regards
> Philippe Berger
> mineurdecharbon at skynet.be
> ----- Original Message ----- From: "Loris Medici"
> <mail at loris.medici.name>
> To: "The alternative photographic processes mailing list"
> <alt-photo-process-list at lists.altphotolist.org>
> Sent: Sunday, August 08, 2010 3:47 PM
> 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.
>> 08.08.2010 15:35, John Brewer yazmÄ±ÅŸ:
>>> I use 15ml formaldehyde to 1 litre of gum.
>>> -----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.
>>> or equivalent.
>>> If so, how much? Is one 500 mg tablet enough for one liter gum?
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