Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,772   Posts: 1,516,553   Online: 949
      
Page 4 of 4 FirstFirst 1234
Results 31 to 34 of 34
  1. #31

    Join Date
    Nov 2002
    Location
    Melbourne, Australia
    Shooter
    Medium Format
    Posts
    971
    Quote Originally Posted by don sigl
    Any information on substituding Sodium Carbonate for the Potassium Carbonate? I'm thinking the sodium compound would be very similar, but would require a different dilution. I've got a lot of it here and could compare the developer against the original D-55 and the Ansco 135 formula. The 135 does a nice job with Forte papers and doesn't produce the green cast.

    D
    Potassium salts are said to give warmer tones.

    The MWs are:

    Na2CO3anhyd 106.0
    Na2CO3mono 124.0
    K2CO3 138.2

    So if a recipe calls for potassium carbonate 200g and you have sodium carbonate anhydrous, the eqivalent amount of the latter is:

    200 x 106/138.2 = 153g

    But the result is likely to be different because the potassium carbonate was probably chosen to make the image warmer.

  2. #32

    Join Date
    Mar 2004
    Location
    Southern California
    Shooter
    Multi Format
    Posts
    3,879
    Images
    11
    Quote Originally Posted by don sigl
    Any information on substituding Sodium Carbonate for the Potassium Carbonate? I'm thinking the sodium compound would be very similar, but would require a different dilution. I've got a lot of it here and could compare the developer against the original D-55 and the Ansco 135 formula. The 135 does a nice job with Forte papers and doesn't produce the green cast.

    D
    Try the APUG Chemical Recipes

    55 D http://www.apug.org/forums/article.php?a=56

    Modified 55D
    http://www.apug.org/forums/article.php?a=112

    Ansco 135 http://www.apug.org/forums/article.php?a=162

    Ansco 130 http://www.apug.org/forums/article.php?a=63
    Tom Hoskinson
    ______________________________

    Everything is analog - even digital :D

  3. #33

    Join Date
    Jul 2006
    Location
    Durham, NC
    Shooter
    Multi Format
    Posts
    306
    Images
    26
    Thanks Tom:

    But I own the cookbooks. I've got quite a bit, except of course the modified 55D. Guess I'll have to include some K Carbonate in my next formulary order.

    D

  4. #34

    Join Date
    Mar 2004
    Location
    Southern California
    Shooter
    Multi Format
    Posts
    3,879
    Images
    11
    Don, Sodium Carbonate will work ok in 55 D but Potassium Carbonate is more soluble.
    Tom Hoskinson
    ______________________________

    Everything is analog - even digital :D

Page 4 of 4 FirstFirst 1234


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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