From: Katharine Thayer (kthayer@pacifier.com)
Date: 07/14/01-03:48:09 AM Z
Judy Seigel wrote:
>
>
> I would assume pthalo would stain heavily on unsized paper, but haven't
> (as I can recall) tried it.
>
Just for the heck of it I tried this yesterday: a stain test with four
different concentrations of pthalo blue mixed 1:1 with ammonium
dichromate on unsized Arches and (just for the heck of it) unsized
cardstock out of my office supply closet. There was a discernable but
very faint stain for all concentrations on both papers; neither paper
showed more staining than the other. The results can be seen on Joe's
gum forum at Bostick & Sullivan.
Unfortunately I can't identify the brand. It was most likely Daniel
Smith, but I have a vague memory of buying pthalo in one of those tiny
little tubes, in which case it would probably have been Winsor & Newton.
Anyway I threw out the tube of paint when I was getting rid of colors
I've tried and decided against using in my gum printing, but I still had
some mixed with gum. It was just a rough test for my own curiosity of
the staining potential of pthalo, since I'd never seen any color stain
as much as Joe's tests showed. It's just another illustration of the
variability of observation across gum printers, which as Judy rightly
says is dependent on the combination of materials, equipment etc we each
choose, plus even differences in how much coating mixture we carry on
the brush and how we wield it.
Katharine Thayer
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