Berg Selenium Toner

Discussion in 'Darkroom Developing and Printing' started by Mark in Maine, Oct 20, 2004.

  1. I was recently given a bunch of photographic chemicals by someone who
    was moving and the movers didn't want to move liquid chemicals. One
    of the things that I got is an unopened bottle of Berg Selenium Toner
    - but it has no instruction sheet with it. When I asked the former
    owner, she said that she had never used it, and had no idea where the
    instruction sheet was. Does anybody who uses this have a reccomended
    dilution and a starting point for time?


    Mark in Maine, Oct 20, 2004
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  2. Mark in Maine

    Tom Phillips Guest

    Toner is toner. As long as it's a concentrate. Berg
    is described as "classic" seleium toner.

    Dilute 1:9 and tone prints for a minimum 3 minutes for
    archival permamence. Kodak's recommendation is 1:20
    but the Image Permanence Institute recommends 1:9.

    Use constant agitation and avoid immersing your bare
    hnads in it.
    Tom Phillips, Oct 20, 2004
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  3. Mark in Maine

    Jan T Guest

    | Use constant agitation and avoid immersing your bare
    | hnads in it.

    Erm, Tom, did you happen to put your fingers in that soup too long..?
    Jan T, Oct 20, 2004
  4. Mark in Maine

    Tom Phillips Guest

    Nope. Always either wear gloves or just rock the tray ;-)

    But I know photographers who have for years. They did always
    seem a bit out there...
    Tom Phillips, Oct 20, 2004
  5. in message
    Berg Selenium Toner appears to be very similar to Kodak
    Rapid Selenium Toner. The toner can be diluted anywhere from
    about 1 part toner to 3 parts water to about 1 part toner in
    20 parts water. At 1:20 the toner will slightly intensify
    the image but not cause much if any color change. As it is
    diluted less it causes an increasing color change. For a
    color change start at about 1:9. The rapidity of toning and
    color will depend on the paper. Cold and neutral tone papers
    will change color very little although they will be
    intensified. Warm tone paper will tone from sepia to purple.
    The developer also makes a difference in the final color.
    Selenium toner at 1:20 was long recommended for
    protecting images against oxidation. About fifteen years ago
    the Image Permenence Institute of Rochester Institute of
    Technology discovered that microfilm recently treated that
    way was oxidizing. They determined that something had
    changed in the in the Kodak toner so that it was no longer
    protecting the low density parts of the image. IPI and
    others now recommend a polysulfide type toner like Kodak
    Brown Toner or Agfa Viradon for image protection. However,
    Selenium toner will still give good image protection if
    toning is carried out far enough. If there is a noticable
    color change in all parts of the image the protection is
    complete. However, the old method of using dilute KRST so
    that there was minimal image change doesn't work. IPI states
    that using 1:9 selenium for not less than 3 minutes, will
    provide complete image protection but it also results in
    some color and density change in most materials.
    Selenium toner at between 1:9 and 1:3 is also effective
    as an intensifier for film. It is relatively controlable and
    the resulting intensified image is permanent.
    Selenium toner can cause stains if the film or paper is
    not fixed completely. In fact, a 1:9 solution of the toner
    can be used instead of sodium sulfide as a test for
    completeness of fixing.
    Acid from acid fixers can sometimes cause an overall
    stain by precipitating elemental Selenium onto the surface.
    This effect is eliminated if the prints are first treated in
    either a sulfite wash aid, like Kodak Hypo Clearing Agent,
    or in a weak alkaline bath like 2% sodium carbonate or
    sodium metaborate (Kodalk). Since the toner contains
    Ammonium thiosulfate prints can be toned immediately after
    fixing with out staining except for the possiblity of stains
    from the acid (I have never observed this in practice).
    Otherwise the prints should be treated in wash aid and well
    washed before toning.
    Selenium toner can be used on combination with a
    polysulfide toner for varying color effects.
    Richard Knoppow, Oct 21, 2004
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