U of S | Mailing List Archive | alt-photo-process-l | Re: gum prints on Yupo

Re: gum prints on Yupo

Marek, my conclusions are the same (amazing when two gum printers can agree about any given material!): (1) "Gelatin sizing was a total disaster, with the gum layer not sticking to it at all. " (2) "The thinner the gum the better the results." I also agree (though I hadn't mentioned this on the pages I reposted yesterday) that the yupo prints fast.

I'm wondering if your brilliant colors are the result of multiple layers? I can't get that much pigment into a thin layer; the prints I did before, and a new test print I made yesterday, don't have as much "chroma" as yours.

I showed a test on one of those pages where I sanded the paper with 320 grit sandpaper and that seemed to give enough tooth to hold the gum, but I didn't say that further experimentation later found it wasn't a good solution, because it made scratches in the yupo that pigment would settle into, showing in the print. I wonder if cleaning powder might have the same effect.

On Nov 2, 2008, at 7:43 AM, Marek Matusz wrote:

If you look closely at the pictures that I posted you can see the "imperfections" in the print, but these are best prints on Yupo that I kept. Gelatin sizing was a total disaster with the gum layer not sticking to it at all.

What worked best for me is no treatment to the sufrace at all. Very thin gum layer (means dilute gum solution) rolled with a gum roller gives decent results. It seems that the thinner the gum the better the results. My exposures got very short as well, around 30 seconds. I wonder if scrubbing the paper with cleaning powder would help a bit?

> Date: Fri, 31 Oct 2008 18:07:00 -0500
> From: erie@shelbyvilledesign.com
> Subject: Re: gum prints on Yupo
> To: alt-photo-process-l@usask.ca
> Having only noticed the yupo threads in passing, I now find myself with
> access to a fair amount of it, mostly in 23x35 sheets of 8mil natural,
> does anybody have a resource with regard to sizing, etc.all in one
> place, or am I doomed to use Thunderbird's horrid search function?
> erie
> Rene Hales wrote:
> > Marek, the flowers in vases are stunning. --Rene
> >
> > -----Original Message-----
> > *From:* Marek Matusz [mailto:marekmatusz@hotmail.com]
> > *Sent:* Friday, October 31, 2008 5:06 PM
> > *To:* alt-photo-process-l@usask.ca
> > *Subject:* gum prints on Yupo
> >
> >
> >
> > Katharine,
> > Thanks for point out this link (or was it Loris in the original
> > post). I never made it that far and it made for a very interesting
> > reading.
> > _http://www.handprint.com/HP/WCL/tech16.html_
> > One thing that Bruce MacEvoy mentions is yupo for one of the
> > experiments and explains why watercolors look very luminous on
> > that substrate. It totally agrees with my observations and has
> > reignited my desire to experiment some more with yupo. I have some
> > nice prints and they just glow. Main problem with it is that gum
> > does not stick to it and it seems to be unpredictable in the way
> > it peels off and flakes. Sometimes patches will come off,
> > sometimes just spots.
> >
> > Here are some prints
> > http://picasaweb.google.com/marekmatusz1/GumBichromateOnYupo#
> > Marek
> >
> > ---------------------------------------------------------------------- --
> > Stay organized with simple drag and drop from Windows Live
> > Hotmail. Try it
> > <http://windowslive.com/Explore/hotmail? ocid=TXT_TAGLM_WL_hotmail_102008>
> >
> >

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