RE: gum print on glass
Katharine, It was 3-amonipropyltriethoxysilane. I am not sure about the origin of the sample as I had a solution of it that I got somewhere. I think this might be the same stuff that B&S sells. It takes very, very little to treat the glass. Marek > Date: Tue, 28 Aug 2007 11:42:16 -0700 > From: kthayer@pacifier.com > Subject: Re: gum print on glass > To: alt-photo-process-l@usask.ca > > Excellent, Marek; thanks for report; it makes me want to get back to > my experiments with that. > > The back-exposed print on glass that I reported most recently was > done with no sub and stuck very well, but it was so overexposed (due > to double dose of dichromate without adjusting exposure) that it > needed some forced development to bring the image out, and I got > impatient with brushing it gently with a soft brush and picked up a > much stiffer brush and used it too aggressively and scrubbed the > emulsion right off the glass. A subsequent trial was a complete > failure; the gum didn't stick to the glass at all. > > If you don't mind my asking, what's the silicone material you're > using for a sub? > > Katharine > > > > On Aug 28, 2007, at 11:18 AM, Marek Matusz wrote: > > > > > > > All, > > I was finaly able do do some gum printing on glass with back > > exposure. First of all gum does not stick on glass in my practice, > > so I took advice from some earlier suggestions and looked for the > > silicone subbing agent that I had for a while but never used on > > anything. After I subbed the glass I just poured gum/pigment > > dichromate mixture on the plate and let it dry. I poured a very > > thick layer, totally opaque to the transmitted light. It took > > several hours to dry and it is a big hassle since it needs to stay > > levelled for a long time (and in the dark). I exposed through the > > back of the glass in full sun for 1 to 2 minutes. These were faily > > dense negatives and by no means optimised for the process. I could > > likely make decent palladium prints with these. The development was > > nice to follow and fairly quick as gum starting to dissove from the > > top revealing image underneath. This felt and worked exactly like > > carbon printing. The tonality of the imafe is excellent with no > > graininess. The image sticks to the subbed glass quite nicely as > > well. No problems with flaking or loosing parts of it. I am now > > experimenting with carbon on glass with back exposure. Stay tuned. > > Marek > > > > See what you’re getting into…before you go there See it! > New home for Mom, no cleanup required. All starts here.
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