[alt-photo] Re: Gum solution help needed

[Trevor Cunningham]

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:
> Loris,
>
> ASPIRINE = ACIDE ACÉTYLSALICYLIQUE
>
> 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 
> Gum
> 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 
> important
> The French Photograph Demachy use only old solution of gum
>
> Best regards
>
> Philippe Berger
> mineurdecharbon at skynet.be
> http://www.philippeberger.net/
> ----- 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.
>>
>> 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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