Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,771   Posts: 1,516,530   Online: 818
      
Page 2 of 2 FirstFirst 12
Results 11 to 12 of 12
  1. #11

    Join Date
    Dec 2004
    Location
    Milwaukee, Wi
    Shooter
    35mm
    Posts
    3,242
    Donald my thoughts about masking for saturation and contrast changes were meant to use B&W film and to make the changes in saturation thru using a panchromatic film and modifying the masks by filtering the light. Sorry am I to not have made this more clearly evident.
    Claire (Ms Anne Thrope is in the darkroom)

  2. #12
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,883
    Images
    65
    There are at least 2 methods of increasing contrast of color prints.

    1. Add about 10ml of 3% hydrogen peroxide to the RA color developer, or 1.6 g/l of cobalt hexammine chloride. This catalytic reaction boosts contrast, but may not work to your satisfaction as it can change color balance. It works best if you use CD6 instead of CD3 and you will get the same dye hues and dye stability.

    OR:

    2. Use the following process:

    a: Develop normally
    b: fix in C41 fix for 1'
    c: wash 5 min at 100F
    d: in the light from here on - rehal ferricyanide bleach for about 1' at 100F
    e: wash 10 min at 100F
    f: redevelop in RA developer until satisfied

    if the contrast does not satisfy you then:

    g: treat in clearing bath of sodium sulfite in water (10g/L)
    h: wash 10' in water 100F
    i: repeat d - f until contrast is up to what you want

    THEN:

    blix
    wash normally
    dry

    This can boost contrast by several grades. Dmin will also come up and yellowing will take place but it can be controlled by the clearing bath and wash times.

    PE

Page 2 of 2 FirstFirst 12


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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