[alt-photo] Re: evaporation of gum mixture

[Katharine Thayer]

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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