From: Katharine Thayer (kthayer@pacifier.com)
Date: 03/18/03-02:25:47 AM Z
A P.S. to my previous post: my observations on humidity may have been
out of place in this thread because my experience has been that humidity
affects exposure, but not staining per se.
Katharine Thayer wrote:
>
> >
> > Your comments on relative humidity are especially interesting. For whatever
> > reason (much lower humidity and/or higher PH water?), my gum exposures are
> > noticeably longer here in Wyoming than those made in New Jersey - with all
> > other variables being the same.
> >
> The winter of 1998-1999 was so wet in the northwest that I had to adjust
> my printing times, and then adjust again in the summer when the rain
> finally stopped. I also remember a time when Stephen Livick was
> pronouncing somewhere that gum simply could not be properly printed at
> any humidity but (I forget the exact number, let's say 58%). At the
> time, I was making perfectly fine gum prints in a dank cellar that
> actually had a stream running through it; I had to wear boots to work.
> Stuff like this is where I get my disdain for absolutist pronouncements
> about how gum works. I'm quite comfortable with the idea that changes in
> humidity require changes in practice, but not with the idea that one can
> only print properly in a particular humidity range.
>
> Katharine Thayer
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