[alt-photo] Re: Gum solution help needed

[Mark Nelson]

Tea tree oil would do it too  

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Aug 8, 2010, at 7:06 PM, Joseph Smigiel <smieglitz at gmail.com> wrote:

> FWIW, I would think a few drops of an antiseptic mouthwash could also act to preserve the gum solution.  Ingredients include water, ethanol, menthol, methyl salicylate (wintergreen), eucalyptol, sodium benzoate, and thymol.
> 
>> 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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