[alt-photo] Re: evaporation of gum mixture

[Paul Viapiano]

Loris, what do you use for storage?


----- 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: Friday, July 02, 2010 12:01 PM
Subject: [alt-photo] Re: evaporation of gum mixture


> Sure... But definitely change your container - if you intend to keep those 
> stock solutions for long, I mean.
>
> Regards,
> Loris.
>
>
> On 02.Tem.2010, at 21:53, Paul Viapiano wrote:
>
>> ...or the water in the gum arabic? Of course, that must be it...
>>
>> So can I just add water to bring it back to its original weight and be 
>> fine?
>>
>> Paul
>>
>>
>>
>> ----- Original Message ----- From: "Paul Viapiano" <viapiano at pacbell.net>
>> To: "The alternative photographic processes mailing list" 
>> <alt-photo-process-list at lists.altphotolist.org>
>> Sent: Friday, July 02, 2010 11:51 AM
>> Subject: [alt-photo] evaporation of gum mixture
>>
>>
>>> Hello all...
>>>
>>> Having traced my pt/pd to a highly alkaline batch of Fabriano , I have 
>>> another question on an entirely different subject.
>>>
>>> Sometimes I make these little premixtures of watercolor pigment and gum 
>>> arabic, nice and handy for printing tricolors in the same pigments. I 
>>> mix about 1 gram pigment to 9 ml of gum.
>>>
>>> In May, I made a mixture and weighed it at 17.9 grams in its plastic 
>>> snap-cap container. Two months later, it weighs in at 17.2 grams. What 
>>> is it that is evaporating? Gum arabic? I'm curious...
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