Switch to English Language Passer en langue franšaise Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 74,520   Posts: 1,645,613   Online: 946
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1
    Bruce Osgood's Avatar
    Join Date
    Sep 2002
    Location
    Brooklyn, N.Y. USA
    Shooter
    Multi Format
    Posts
    2,516
    Images
    52

    Sodium Bisulfite > Sodium Metabisulfite

    I'm mixing a formula that contains 5g sodium bisulfite as a buffer to hydroquione. I don't have bisulfite but I do have metabisulfite. Is this apples and oranges or is there a conversion?
    Bruce Osgood
    Chinese proverb
    "Print with #3.5 and burn with #1.5." B.J. Confucius
    http://www.flickr.com/photos/camclicker/

  2. #2

    Join Date
    Jun 2003
    Location
    Los Angeles, CA 90061
    Shooter
    35mm
    Posts
    170
    They are the same thing.

  3. #3
    juan's Avatar
    Join Date
    May 2003
    Location
    St. Simons Island, Georgia
    Shooter
    Multi Format
    Posts
    1,646
    Images
    4
    I've used the metabisulfite as a direct gram to gram substitute with no problem. Maybe a chemist can tell us the real story.
    juan

  4. #4
    Bruce Osgood's Avatar
    Join Date
    Sep 2002
    Location
    Brooklyn, N.Y. USA
    Shooter
    Multi Format
    Posts
    2,516
    Images
    52
    Quote Originally Posted by juan View Post
    I've used the metabisulfite as a direct gram to gram substitute with no problem. Maybe a chemist can tell us the real story.
    juan
    Thanks Juan,
    I'll go with 1 to 1 until I hear otherwise. Thank you,
    Bruce Osgood
    Chinese proverb
    "Print with #3.5 and burn with #1.5." B.J. Confucius
    http://www.flickr.com/photos/camclicker/

  5. #5
    Robert Hall's Avatar
    Join Date
    Aug 2004
    Location
    Lehi, Utah
    Shooter
    ULarge Format
    Posts
    2,039
    Images
    28
    They are not the same and the ph is different. I would ask Gerald Koch about this.
    Robert Hall
    www.RobertHall.com
    www.RobertHall.com/mobile
    Apug Portfolio
    Facebook Profile


    Technology is not a panacea. It alone will not move your art forward. Only through developing your own aesthetic - free from the tools that create it - can you find new dimension to your work.

  6. #6

    Join Date
    Jan 2005
    Location
    Boston, MA
    Shooter
    Multi Format
    Posts
    1,416
    Why do you say that? When dissolved in water, metabisulfite forms bisulfite ion and they are the same thing. In amateur darkroom formulae I doubt anyone ever used pure sodium bisulfite in dry form as an ingredient; it's a misnomer.

  7. #7
    Ole
    Ole is offline
    Ole's Avatar
    Join Date
    Sep 2002
    Location
    Bergen, Norway
    Shooter
    Large Format
    Posts
    9,282
    Blog Entries
    1
    Images
    31
    In solution, they're identical.

    There's a difference in the crystal structure, but that doesn't matter at all as soon as it's dissolved.
    -- Ole Tjugen, Luddite Elitist
    Norway

  8. #8
    Robert Hall's Avatar
    Join Date
    Aug 2004
    Location
    Lehi, Utah
    Shooter
    ULarge Format
    Posts
    2,039
    Images
    28
    Thank you for the clarification. It was my understanding that Metabisulfite had a lower ph, is this not true?

    thx
    Robert Hall
    www.RobertHall.com
    www.RobertHall.com/mobile
    Apug Portfolio
    Facebook Profile


    Technology is not a panacea. It alone will not move your art forward. Only through developing your own aesthetic - free from the tools that create it - can you find new dimension to your work.

  9. #9

    Join Date
    Dec 2004
    Shooter
    Multi Format
    Posts
    1,670
    When Kodak sold chemicals a mixture of sodium bisulfite and sodium metabisulfite was sold as sodium bisulfite. If you look at the MSDS for sodium bisulfite it is listed as 58 - 99% sodium bisulfite and 0 - 42% sodium metabisulfite. Pure sodium bisulfite is sold as a 40 - 45% solution rather than as a solid.

    Kodak recommended using the same amount regardless of which chemical the formula mentioned.

  10. #10
    Bruce Osgood's Avatar
    Join Date
    Sep 2002
    Location
    Brooklyn, N.Y. USA
    Shooter
    Multi Format
    Posts
    2,516
    Images
    52
    Quote Originally Posted by Gerald Koch View Post
    ..............

    Kodak recommended using the same amount regardless of which chemical the formula mentioned.
    Works for me. Thanks to all who contributed.
    Bruce Osgood
    Chinese proverb
    "Print with #3.5 and burn with #1.5." B.J. Confucius
    http://www.flickr.com/photos/camclicker/

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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