Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 75,779   Posts: 1,671,161   Online: 812
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1

    Join Date
    Jun 2015
    Shooter
    8x10 Format
    Posts
    3

    blank areas on salt print

    Hi
    I am having a hard time with salt paper printing. Some parts of it remain white, just if they were not sensitized.

    Salting is a 5mn bath in citric acid 20g/salt 20g/gelatin 4g.
    Sensitizer is a 10% silver nitrate solution applied with coton ball TWICE.
    Anybody has an idea of where my problem comes from??
    thanks in advance
    Laurent Millet
    Attached Thumbnails Attached Thumbnails image1.jpg  

  2. #2
    NedL's Avatar
    Join Date
    Aug 2012
    Location
    Sonoma County, California
    Shooter
    Multi Format
    Posts
    1,353
    Images
    30
    I've seen something like that happen when I dipped my hake brush in distilled water and did not shake it out well enough before applying the silver nitrate. Since then I always use my hake brush dry. Did you wet the cotton ball first?

    Was the paper completely dry before applying the silver nitrate solution?

    Edit: and welcome to APUG!

  3. #3
    cliveh's Avatar
    Join Date
    Oct 2010
    Shooter
    35mm RF
    Posts
    4,192
    Images
    347
    Quote Originally Posted by pneumato View Post
    Hi
    I am having a hard time with salt paper printing. Some parts of it remain white, just if they were not sensitized.

    Salting is a 5mn bath in citric acid 20g/salt 20g/gelatin 4g.
    Sensitizer is a 10% silver nitrate solution applied with coton ball TWICE.
    Anybody has an idea of where my problem comes from??
    thanks in advance
    Laurent Millet
    I think you have answered your own question in the first sentence - “Some parts of it remain white, just if they were not sensitized".

    “The contemplation of things as they are, without error or confusion, without substitution or imposture, is in itself a nobler thing than a whole harvest of invention”

    Francis Bacon

  4. #4

    Join Date
    Mar 2011
    Shooter
    Med. Format RF
    Posts
    326
    well somewhat remote, but plausible, is contamination! 1.either the paper from a store you bought it from? someone could have spilled on it, then left it to dry. 2.you yourself or someone close to you could have done that too. remember there are chemical foggants out there.
    I would strongly suggest you use a glass rod/push rod for both salt solution and for silver nitrate solution. If you haven't read MECHANISMS OF CONTROLLING COLOUR AND AESTHETIC APPEARANCE OF THE PHOTOGRAPHIC SALT PRINT by eleanor d. young. Its a good read.

  5. #5

    Join Date
    Mar 2011
    Shooter
    Med. Format RF
    Posts
    326
    by the way, I really enjoyed your print!!!!! its not to often around here, that we get to see "abstract" work. best regards greg

  6. #6

    Join Date
    Jun 2009
    Location
    Lower Earth
    Shooter
    Medium Format
    Posts
    1,958
    Blog Entries
    2
    Images
    45
    I agree w/ gzinsel. Just sign it Clyfford Still, and hang it proudly on the wall.

    http://www.google.com/imgres?imgurl=...Z-kQsIEM&itg=1

  7. #7
    Herzeleid's Avatar
    Join Date
    Oct 2008
    Location
    Ankara/Turkey
    Shooter
    Multi Format
    Posts
    194
    Try doublecoating with %10 silver nitrate. If the problems gone it means you need a stronger silver nitrate solution.

    I would have used slightly more than %12 to begin with because %2 salt and %2 citric acid in sizing.

    Good reading on silver salt ratios.
    http://unblinkingeye.com/Articles/POP/pop.html

  8. #8

    Join Date
    Jun 2012
    Location
    UK
    Shooter
    Multi Format
    Posts
    2,515
    Images
    6
    It's just a miscoating, nothing to do with needing double coats or stronger nitrate or contamination.
    you've missed the bit that is white, nothing more.

    take more care with coating, do it under a tungsten lamp so you can see what you are doing, and perhaps try a different material than cotton wool - a foam brush for instance. Cotton wool strikes me as not the best choice - too absorbent

  9. #9

    Join Date
    Jun 2015
    Shooter
    8x10 Format
    Posts
    3
    Quote Originally Posted by gzinsel View Post
    well somewhat remote, but plausible, is contamination! 1.either the paper from a store you bought it from? someone could have spilled on it, then left it to dry. 2.you yourself or someone close to you could have done that too. remember there are chemical foggants out there.
    I would strongly suggest you use a glass rod/push rod for both salt solution and for silver nitrate solution. If you haven't read MECHANISMS OF CONTROLLING COLOUR AND AESTHETIC APPEARANCE OF THE PHOTOGRAPHIC SALT PRINT by eleanor d. young. Its a good read.
    I used several papers with same results. All were high quality papers: Ruscombe Chateau Vellum and Fabriano Artistico. I discovered yesterday the thesis from Mrs Young, which is as you say an instructive book.
    Thanks!

  10. #10

    Join Date
    Jun 2015
    Shooter
    8x10 Format
    Posts
    3
    Quote Originally Posted by Herzeleid View Post
    Try doublecoating with %10 silver nitrate. If the problems gone it means you need a stronger silver nitrate solution.

    I would have used slightly more than %12 to begin with because %2 salt and %2 citric acid in sizing.

    Good reading on silver salt ratios.
    http://unblinkingeye.com/Articles/POP/pop.html
    Thanks for your advice, I am going to try this today.

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin