[alt-photo] Re: evaporation of gum mixture

[Paul Viapiano]

Formulary, til present.

Then, will switch to DS.

p

----- Original Message ----- 
From: "Katharine Thayer" <kthayer at pacifier.com>
To: "The alternative photographic processes mailing list" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Friday, July 02, 2010 12:54 PM
Subject: [alt-photo] Re: evaporation of gum mixture


> Paul, what gum are you using?
>
>
> On Jul 2, 2010, at 11:51 AM, Paul Viapiano wrote:
>
>> 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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>>
>
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