[alt-photo] Re: evaporation of gum mixture

[Loris Medici]

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...