direct gum print

Katharine,
Thanks for such a fast action.
Marek

>From: Katharine Thayer <kthayer@pacifier.com>
>Reply-To: alt-photo-process-l@usask.ca
>To: alt-photo-process-l@usask.ca
>Subject: Re: Gum hardening: top down experiment good image
>Date: Thu, 13 Apr 2006 08:27:58 -0700
>
>Here's Marek's print (it's awesome)
>
>http://www.pacifier.com/~kthayer/html/Marek.html
>
>Enjoy.
>kt
>
>
>On Apr 13, 2006, at 7:32 AM, Katharine Thayer wrote:
>
>>I'd be happy to add this to my website, Marek, just send it to me as a
>>jpeg and (now that I have a better mail program than when I tried to do
>>this with Chris) I can just take it and upload it.
>>Katharine
>>
>>
>>On Apr 13, 2006, at 7:06 AM, Marek Matusz wrote:
>>
>>
>>>
>>>It took me two day to sort thing out a bit. I have repeated the
>>>experiments with the HP transparency coated on the emulsion side with
>>>the thick gum mixture. I tried exposure form the back from about 5 to 30
>>>minuts and every time the result was the same. I could see the image
>>>developing, I would take it out of water and literally see it melting in
>>>front of me. Even lying flat. It looked like gelatine meting, kind of
>>>losing shape, becoming softer and ending up with a puddle of pigmented
>>>gum (remember the Indiana Jones movie?). After removing all the gum from
>>>the transparency I noticed a very nice tan image embeded in the
>>>transparency coating. Kind of like a very thin of pyro stain. All the
>>>details vere there if you held it to the ligh just so. So something was
>>>happening with htis transparency coating that was messing up with my
>>>experiments.
>>>
>>>Next logical thing was to put the gum on the uncoated side. I coated a
>>>couple sheets, exposed through the back They all developed by dissolving
>>>the unhardened gum from the top, revealing a continuous tome image
>>>beneath. The image was rather robust, with no tendency to flake, slide
>>>off or anything. Did I mention that on some of the sheets I removed the
>>>coating by soaking in chlorox and scrubbing with a brush.
>>>
>>>It is so amazing how easy it was to make a good image. My coating was
>>>very heavily pigmented and thick. I could barely see through it looking
>>>directly into a 50W light bulb.
>>>Same coating exposed from the front simply flaked away. Same emulsion
>>>coated on paper and exposed in the usual way for 15 minutes mosty
>>>flaked off with a very contrasty result that did not resemble the
>>>original image to a great extent.
>>>
>>>I am really excited about making prints on glass and perhaps transfer to
>>>paper.
>>>I do not have a web page, but I scanned the transpareny in my flat bed
>>>scanner (not in the transparency mode, it is just a reflective scanner).
>>>Katharine maybe you can add it to you page or somebody else. I could put
>>>it on one of the free web site, but I will not have time to mess with it
>>>until the weekend.
>>>
>>>All this most likely does not relate to regular practice of gum printing
>>>wityh very thin layers, where I think enough light is passed through to
>>>harden the entire layer (pehaps a crosslinking is a better term) and
>>>then during the development phase wash away the gum and pigment in
>>>proportion to the crosslinking. Paper does interact as well and I see it
>>>soaking dichromate from the gum solution on the first coat, just like a
>>>lot of people have observed. Oddly enough this does not happen on
>>>subsequent coats if you do multicoat gums.
>>>
>>>Experimentation rules
>>>Marek, Houston
>>>
>>>
>>>
>>>
>>>>From: Katharine Thayer <kthayer@pacifier.com>
>>>>Reply-To: alt-photo-process-l@usask.ca
>>>>To: alt-photo-process-l@usask.ca
>>>>Subject: Re: Gum hardening: top down experiment
>>>>Date: Wed, 12 Apr 2006 17:05:21 -0700
>>>>
>>>>I don't know if anyone was planning to try this with Pictorico, but
>>>>just in case, let me report that I just used my last piece of
>>>>Pictorico for a quick experiment and I wouldn't recommend it, for
>>>>several reasons:
>>>>
>>>>(1) Pictorico goes sticky when it gets wet, so it's very difficult to
>>>>smooth out the coating; the sticky coating on the Pictorico hangs onto
>>>> the gum the way it was laid down with the first stroke of the brush,
>>>>and that's how it stays. You just can't move the gum around on the
>>>>surface.
>>>>
>>>>(2) the coating on the Pictorico hangs onto the dichromate, as some
>>>>paper/sizing combinations do, and the Pictorico will take on a bright
>>>>yellow cast that will have to be removed with metabisulfite.
>>>>
>>>>(3) you can't dry it with a hair dryer. This may not be a problem for
>>>>those who don't usually use a hair dryer, but that's how I always dry
>>>>my gum layer, and the heat turns the Pictorico white. This cleared to
>>>>clear after a while, on the first drying, but on the second drying
>>>>(after treating with metabisulfite and rinsing in water again) I found
>>>>that the white didn't go away in some places.
>>>>
>>>>Other than those few things, it really makes a great image.
>>>>Katharine
>>>>
>>>>
>>>
>>>
>>>
>>>
>>
>>
>
Received on Thu Apr 13 11:29:43 2006