U of S | Mailing List Archive | alt-photo-process-l | Re: Miracle size for gum

Re: Miracle size for gum

Here's a 3min video going from just having set everything out to coat to a finished coat of full strength Gamblin PVA Size (I like the semi-luster feel of the full strength). Once the print is hung it's ready to be printed on in 5-15 minutes depending on how long it takes to full dry.

Also, I coated a second image, but the digi-camera I was taking the video with died on me. In the first video I should NOT have gone back to the PVA with the foam brush for a 3rd time as I didn't need that extra and that's why it takes me so long to brush it smooth--too much solution. The whole process, when you don't use too much PVA, takes less than 1/2 the amount of time this coating did.


Gamblin PVA Size, $0.99 foam brush, the highest density foam roller you can get at Lowe's, Rives BFK with the palladium image already printed.


On Fri, Oct 9, 2009 at 3:41 PM, Jeremy Moore <jeremydmoore@gmail.com> wrote:
Marek, I agree, this stuff is miraculous in terms of speeding up the workflow and making it less toxic.


On Fri, Oct 9, 2009 at 3:37 PM, Marek Matusz <marekmatusz@hotmail.com> wrote:

A few weeks ago there was some discussion on PVA sizing and I decided to try it for gum. I also bought some rabbit skin glue, but have not gotten to it yet. Anyways, the PVA is Gamblin PVA size in 32oz bottle. Here is what I have done: soaked a few sheets of Fabriano Artistico paper in room temperature water for about 30 minutes re-shink and then dried them. Next, brushed PVA/water mixtures at about 20cc/sheet of paper (these are big sheets 22x30). Started with straight PVA and went on diluting it 1:1, 1:2 and 1:3. Brushing is quite easy. After drying the papers overnight I printed some test strips. Straight PVA and 1:1 dilution left the paper too slick and the gum would just flake off. The 1:2 turned out to be a miracle! The gum coats the paper nicely and after a few brushstrokes it seems to cling to the paper. Rolling with a foam roller to smooth it out was so easy. My impression is that some of that PVA size is redissolved and mixed with gum when coating, but that might not be the case. At 1:3 dilution there might be some staining after development,  but it might clear with a longer development and I just did not have to to mess  with it aftr I saw the results of sizing with 1:2 dilution.
Here are some examples of test prints done on that paper. I was aiming at refining my one coat, one exposure  of very long range gums, and I think I finally have arrived at  final solution. PVA sized paper clears beautifully leaving no stain behind. Long exposures and blech develoment result in full tonal range with absolutely no stain on the paper. I have also included a test strip with a shorter exposure and very long development. I do not have patience to develop for 8 hours or more, but it resulted in very nice tonal gradation and no stain. Actually it is not even possible with 6-12 prints that I handle at a time to develop that long, no room to soak it all. Bleach development takes at most 30 minutes.
Here are the test strips

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