From: Harry B (hbonham@abracadata.com)
Date: 06/17/02-09:52:15 AM Z
To all,
I use Liquitex Gesso as a paper sizing only. I mix it 1:1 and paint on the
paper. As Gesso has a rough tooth, the gum emulsion adheres to the paper
quite well. I would not recommend using Gesso over any image unless the
image needs to be hidden. Gesso is opaque even in a diluted state.
I have also used Liquitex Matte Medium as a size between layers of gum. That
was a disaster... While it dries clear it does create the Teflon effect
described in the original post. I have used a layer of heated gelatin
successfully however. The gelatin - mixed as per the original paper size
recommended in most publications - is just lightly brushed onto the paper.
The emulsion is then painted and exposed and developed with your normal
technique.
As with everything gum, practice, practice, practice.
> Well, this is interesting. I just remembered a post from Harry Bonham
> who recommended acrylic sizing to the list a while back; I looked up his
> post and he says he recommends diluting at 1:1, just as you did. I
> suspect, like everything in gum, it depends on what brand you're using.
> I've never used Liquitex and I don't know which brand Harry uses, but I
> use Daniel Smith, which is very concentrated, and find 1:8 or 1:9 works
> well; anything stiffer tends to the teflon effect you described. I think
> you just have to experiment with your brand and find out what works for
> you. And maybe experiment on a scrap of paper this time? Just a
> thought.... Actually, I'd really like that if you use pyro negatives
> for your gum and platinum, because I have yet to see a straight gum from
> a pyro negative and would like to see what one looks like. I've made
> pyro negatives myself, but they never seemed to stain, so my "pyro"
> negatives are really just silver negatives. I'm still interested in the
> spectral density quality of the pyro negative as it relates to platinum
> and to gum; that question has never been resolved to my satisfaction.
> Katharine
>
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