Re: Pointless discussion?

Hi,

yes and no Mark, from what Katherine said before Pictorico transparencies may not be very well suited for printing gum to begin with. My question was more about the archival property of the material or plastic used and I was thinking more about transparent one that could be used for gum prints. I think Ryuji made the point that there are some type of plastic transparencies that could last a very long time. Now the question would be can we find a material that is colorless (no color cast), transparent (back exposure), thin (minimal loss of sharpness), mecanically resistant (scratches), archival (centuries) and that gum would adhere well on it?

If I read Marek's experiment correctly, the one Katherine graciously posted on her web site, this print is a one coat gum print exposed from the back. This sound very interesting and seemed to have a lot of potential as Katherine pointed out. My concern then was the material used archival to the same degree, more or less then gum prints on paper. There are so many kinds of plastic I just wondered if they would last and from limited experience with them I was affraid they wouldn't be.

I suspect it wont be long before someone finds a good combinaison of materials and better still someone will probably make a gum print this way with lots of relief, just like it's possible to do with carbon prints.

Regards
Yves

----- Original Message -----
  From: Ender100@aol.com
  To: alt-photo-process-l@usask.ca
  Sent: Friday, April 14, 2006 12:24 AM
  Subject: Re: Pointless discussion?

  Yves,

  If I understand your question correctly, you are wondering about inkjet negatives and them degrading after repeated use and exposure to UV light?

  I am going to run some tests on this when I get some time - basically read the density of various colors and then leave that negative in my plate burner and log the exposures and re-measure at intervals as I expose other prints.

  In the meantime, I have negatives made on the 2200 with Ultrachrome inks and on the epson R2400 which uses the Ultrachrome K3 inks and have used them for about 10 exposures with no noticeable change in density. This would be about two hours of exposure total.

  Hope this is helpful,
  Mark Nelson
  Precision Digital Negatives

  In a message dated 4/13/06 6:12:13 PM, gauvreau-yves@sympatico.ca writes:

    One relatively important question I have about using transparencies is this,
    how long they last? And I want to say I like the idea of doing prints from
    the back like that, it's not the method I'm concerned with it's the material
    used. The limited knowledge I have of them is that they are in general quite
    succeptible to UV and degrade relatively fast in poor conditions. I saw a
    few times that pigments on paper can last as long as a few centuries, if my
    information is exact these transparencies would be dust by the first century
    and probably useless in about 10 to 25 years, yellowing, lost of
    transparency and even physical deformation. Nothing I would like better then
    be wrong on this one.
Received on Fri Apr 14 04:00:57 2006