[alt-photo] Re: Gum solution help needed

[Philippe Berger]

It is different but for the carbon Transfer, i use only the Formalin witout 
problem

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 3:59 PM
Subject: [alt-photo] Re: Gum solution help needed


>  In my case, it was 2 litre jar with little (100-150ml) in bottom. Maybe 
> the students in the photo centre didn't pay attention to seal the bottle 
> carefully. Anyway, I think many will prefer something other than formalin 
> for the job -> especially considering it's hard to purchase in some parts 
> of the world.
>
> Regards,
> Loris.
>
>
> 08.08.2010 16:52, John Brewer yazmış:
>> 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.
>
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