FOMABROM VARIANT IV 123

Discussion in 'B&W: Film, Paper, Chemistry' started by Richard Jepsen, Sep 23, 2011.

  1. Richard Jepsen

    Richard Jepsen Member

    Messages:
    683
    Joined:
    Jul 1, 2006
    Location:
    Oklahoma, US
    Shooter:
    Med. Format RF
    I just ordered this paper to experiment with. What does this product description mean?

    FOMABROM VARIANT IV 123 is manufactured using a heavy spar loaded paper
    base material (unprepared photographic paper).
     
    Last edited by a moderator: Sep 23, 2011
  2. Richard Jepsen

    Richard Jepsen Member

    Messages:
    683
    Joined:
    Jul 1, 2006
    Location:
    Oklahoma, US
    Shooter:
    Med. Format RF
    Sorry, a Google search got results.. Here is what I found.

    It is calc-spar, in a setting of heavy-spar or sulphate of baryta. 1885 Encycl. Brit. XIX. 86/2 Baryta White..is prepared by grinding to a fine powder the pure white native sulphate of baryta (heavy spar).

    Baryta fills in paper for opacity and aids in maintaining paper flatness.

    Unprepared photographic paper implies un-sensitized paper; but must relate to the application of the baryta.
     
    Last edited by a moderator: Sep 23, 2011
  3. paul ron

    paul ron Member

    Messages:
    1,897
    Joined:
    Jan 22, 2004
    Location:
    NYC
    Shooter:
    Medium Format
    Baryta is sort of a sealant (like gesso on canvas) as well as a brightener base on paper. It ensures an even coating of emulsion preventing it from soaking into the paper itself.

    .
     
  4. GLSmyth

    GLSmyth Member

    Messages:
    34
    Joined:
    Jan 28, 2009
    Shooter:
    Large Format
    I am wondering if anyone has noticed a change in the emulsion of this paper recently. It appears to me that the supercoating may be harder than it has been in the past. Any idea where I might go to find out if this is true?

    Cheers -

    george