Page 1 of 3 123 LastLast
Results 1 to 10 of 22

Thread: Canson Platine - edges discoloring

  1. #1

    Join Date
    Aug 2006
    Location
    Connecticut
    Posts
    144

    Canson Platine - edges discoloring

    Click image for larger version. 

Name:	Platine LF.jpg 
Views:	66 
Size:	193.7 KB 
ID:	196654

    This Platine print was hot mounted on rag board with acid free tissue, but the edges are discoloring. I have one other print doing the same thing. Only these 2 prints were hot mounted, I usually use corners. Tried to send a message to Canson with no response and cannot find a contact phone number for them. Also checked with the maker of the tissue and they are stumped as well. Does anyone know the upper temp limit for hot mounting these papers? I typically use 185F. Thank you.
    r.j. phil
    www.rjphil.com
    N.E. Large Format Photography Collective

  2. #2
    Peter De Smidt's Avatar
    Join Date
    Jan 2001
    Location
    Fond du Lac, WI, USA
    Posts
    7,040

    Re: Canson Platine - edges discoloring

    The paper doesn't have optical brighteners, right? There's so many variations of papers, that's it's hard to be sure. How were they mounted in the press? Release paper? Mat board?
    You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.
    ― Alexander Den Heijer, Nothing you don't already know

  3. #3
    Moderator
    Join Date
    Jan 2001
    Posts
    7,299

    Re: Canson Platine - edges discoloring

    Quote Originally Posted by rjphil View Post
    Tried to send a message to Canson with no response and cannot find a contact phone number for them.
    How's your French?

    Canson - Canson-Infinity.com
    RCS CANSON SAS : 335 620 241
    N67 rue Louis et Laurent Seguin - CS 70139 - 07104 Annonay Cedex - France
    Phone : 04 75 69 88 00

    https://www.canson-infinity.com/en/l...es-and-privacy

  4. #4

    Join Date
    Jul 2016
    Posts
    4,335

    Re: Canson Platine - edges discoloring

    Quote Originally Posted by rjphil View Post
    Click image for larger version. 

Name:	Platine LF.jpg 
Views:	66 
Size:	193.7 KB 
ID:	196654 but the edges are discoloring.
    There is a way to check if OBAs are present. Take an UV torch ($10, amazon)...


    ...and in darkness see if the paper is fluorescent. If you are not used to check that then use a paper sample known to not contain OBAs and another sampe known to contain it, to learn to see the difference, which is quite evident anyway in new papers, but more difficult to see when the OBAs are faded by aging.


    The other suspect is acid, even very small amounts of acid in cardboard may turn prints yellow, the process is faster if also OBAs are there.

    Overtemperature when pressing is a contributiong factor, as (my guess) with overheating acid flyes from any place to the wrong place. 185F should be OK , I'd use this: https://www.drytac.com/product/flobondcarrierfree/ 175-200F (79-93C). Anyway, if it's true Canson, migration of acid to the surface should be the reason, the question is how acid ended there.


    Many times exposing these yellowed prints to direct sunlight may totally remove the yellowing. I'd try that, also you may use an UV flood to do it indoors. You may place the UV torch on a corner for a week to see if it works.

  5. #5

    Join Date
    Jun 2015
    Location
    Glasgow
    Posts
    614

    Re: Canson Platine - edges discoloring

    Quote Originally Posted by rjphil View Post
    Click image for larger version. 

Name:	Platine LF.jpg 
Views:	66 
Size:	193.7 KB 
ID:	196654

    This Platine print was hot mounted on rag board with acid free tissue, but the edges are discoloring. I have one other print doing the same thing. Only these 2 prints were hot mounted, I usually use corners. Tried to send a message to Canson with no response and cannot find a contact phone number for them. Also checked with the maker of the tissue and they are stumped as well. Does anyone know the upper temp limit for hot mounting these papers? I typically use 185F. Thank you.
    Two major questions: what was your dwell time; and is the board buffered or unbuffered?

    The paper is OBA free as far as I know, but may have incorporated pigments or similar to whiten it.

  6. #6
    Vaughn's Avatar
    Join Date
    Jan 2007
    Location
    Humboldt County, CA
    Posts
    7,421

    Re: Canson Platine - edges discoloring

    I would say incomplete clearing. The chemicals entered into the paper deeper thru the cut edges and thus not did not clear as fast as the rest of the paper.

    Solutions: Less time in chemicals, longer clearing, or cut off edges after processing and drying.
    "Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China

  7. #7

    Join Date
    Jun 2017
    Location
    Corvallis, OR
    Posts
    622

    Re: Canson Platine - edges discoloring

    Quote Originally Posted by Vaughn View Post
    I would say incomplete clearing. The chemicals entered into the paper deeper thru the cut edges and thus not did not clear as fast as the rest of the paper.

    Solutions: Less time in chemicals, longer clearing, or cut off edges after processing and drying.
    Vaughn, it is my understanding that this print is on Canson Platine, which is an inkjet paper, not silver gelatin. Admittedly this problem does resemble what you describe.

  8. #8
    Vaughn's Avatar
    Join Date
    Jan 2007
    Location
    Humboldt County, CA
    Posts
    7,421

    Re: Canson Platine - edges discoloring

    Whoops! The "Platine" threw me...I was thinking digital neg, too.
    Last edited by Vaughn; 18-Oct-2019 at 14:17.
    "Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China

  9. #9
    Philippe Grunchec's Avatar
    Join Date
    Jul 2007
    Location
    Paris (France, not Texas)
    Posts
    294

    Re: Canson Platine - edges discoloring

    Or did you mean Arches Platine?
    "I believe there is nothing more disturbing than a sharp image of a fuzzy concept!" (Ansel Adams)

    http://philippe.grunchec-photographe.over-blog.com/

  10. #10

    Join Date
    Sep 2003
    Location
    Massachusetts USA
    Posts
    8,297

    Re: Canson Platine - edges discoloring

    Hi RJ -

    My experience is limited but I've never encountered any recommendations for hot-mounting inkjet prints.

    Are the paper base, inkjet receptor coating, inks, pigments, gloss agents and binders designed for heating ?

    I print on Canson Platine Fibre Rag regularly (no OBA's, 100% rag) but I never permanently fasten prints to a backing board. No adhesives of any kind: just framing corners, archival back and overmat. The mat is over-sized to give a 3/8 reveal all around, so you see the original paper and composition but the image is held flat. Because Platine is heavy there's little worry about curling. With a mat over the print there is no contact between the glass and the image.

    - Ken

Similar Threads

  1. Canson Rag and Platine Photographique
    By Arthur Nichols in forum Digital Processing
    Replies: 7
    Last Post: 1-Feb-2015, 08:17
  2. Canson Platine Fibre Rag + Epson R1800 Questions
    By spacegoose in forum Digital Hardware
    Replies: 0
    Last Post: 28-Jun-2011, 18:30
  3. Arches Platine
    By Andrew O'Neill in forum Darkroom: Film, Processing & Printing
    Replies: 10
    Last Post: 21-May-2007, 18:31

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •