[alt-photo] Re: Gum solution help needed

[Philippe Berger]

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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