Re: Yupo, was Re: Temperaprint & Gum

So why did you wipe it Richard? Does it pool on the surface? I think the
left part of the image looks not too bad...what if you used two coats?

Kate
----- Original Message -----
From: "Richard Sullivan" <richsul@earthlink.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Sunday, March 14, 2004 10:29 AM
Subject: Re: Yupo, was Re: Temperaprint & Gum

> This thread got me to doing a quite experiment.
>
> As far as the archivalness of Yupo which is biaxially oriented
> polypropylene (BOPP) it is in the mid category, whatever that might be.
>
> Modern plastics are far better than they were 25 years ago and do get
> unfairly bad mouthed. "Paper has proven itself..." "You can't trust
> accelerated testing ..." blah blah, are thrown out, and yes there is a bit
> of truth to them. That being said there are some modern materials that are
> considered to be in the archival category The most intriguing one is
> Melinex, a Dupont special form of Mylar which is designed for archival
> applications. Some Ilford color "papers" are on Melinex film. Wilhelm
rates
> Ataraxia's color carbons on Melinex at grater than 300 years and I suspect
> the color pigment is the limiting factor and not the Melinex.
>
> I had some microporous Melinex here designed for inkjet printing.
Virtually
> all of the new inkjet materials are microporous, that is they have been
hit
> with some kind of electronic field that puts zillions of very tiny holes
in
> the surface. These holes are in the micron size, extremely tiny. For some
> reason the newer pigment inkjet inks will not stick to gel coated paper so
> they've gone to this system.
>
> Colloids stick well to Melinex and it makes a nice support for carbon
> prints. I suspect Petes temperaprint system would work on it as well and
> perhaps a good surface for gum printing.
>
> Just for fun I coated it with some vandyke solution. I brushed it on and
> then wiped it off with a paper towel leaving only that which went into the
> holes. I suspect I printed it while part was wet so thus the streaks.
>
> The dmax is about 1/2 of what one would want.
>
> The image is at: http://www.photohistorycenter.org/Melinex1.htm
>
> Ok, so what? A bad image. But something to think about. It may be useful
> for other things or maybe a way to up the dmax. A start perhaps in a new
> direction.
>
> --Dick
>
>
>
> At 10:10 PM 1/30/2004, you wrote:
> >Loris,
> >
> >No, Yupo did not absorb the sensitizer. It just set on the surface and
> >waited to dry, with some puddles. Evening out the sensitizer over the
> >paper, without streaking, was the main problem. Try to apply a coating of
> >vandyke, kallitype or pallaidum sensitizer to a sheet of plastic and you
> >will see what I mean.
> >
> >I may try Pete's suggestion and add a bit of colloid to the sensitizer
and
> >try again. Would this make the coating an emulsion?
> >
> >
> >
> >Sandy
> >
> >
> >
> >
> >
> >>Sandy, how did you manage to coat kallitype emulsion to Yupo? Does it
absorb
> >>the emulsion or you coated a "primer" (gelatin and such) before? What
were
> >>the problems when coating kallitype?
> >>
> >>Regards,
> >>Loris.
> >>
> >>----- Original Message -----
> >>From: "Sandy King" <sanking@clemson.edu>
> >>To: <alt-photo-process-l@sask.usask.ca>
> >>Sent: Friday, January 30, 2004 6:20 PM
> >>Subject: Yupo, was Re: Temperaprint & Gum
> >>
> >>> ...
> >>> I have used Yupo as a base for making carbon tissue and in this
> >>> application it works very well. I have also attempted to print on it
> >>> with kallitype and palladium but with mixed results. If one could
> >>> ...
>
>
>
>
Received on Sat Mar 13 16:38:04 2004