Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,733   Posts: 1,515,362   Online: 985
      
Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 38
  1. #11
    Ed Sukach's Avatar
    Join Date
    Nov 2002
    Location
    Ipswich, Massachusetts, USA
    Shooter
    Medium Format
    Posts
    4,520
    Images
    26
    Quote Originally Posted by jdef
    Basically, photographic printing papers are made up of two parts; the base, which could be fiber or RC,..
    Not ... quite...

    *Most* paper bases are fiber. Ilford does make color papers with plastic bases - I think Kodak does also... but "RC" indicates that the fiber base itself is layered on both sides with polyethylene and is generally impervious to liquids ... yeah, yeah, I know, not the edges ... see "generally".

    Having the base impermeable saves it form being soaked with liquid, therefore requiring long wash times, and curling, which, in itself is enough to "sell" me.
    Carpe erratum!!

    Ed Sukach, FFP.

  2. #12
    clay's Avatar
    Join Date
    Nov 2002
    Location
    Asheville, North Carolina
    Shooter
    Multi Format
    Posts
    1,118
    Images
    8
    If you want to get really picky, platinum and Van Dyke and cyantoype are technically not emulsions either, since the sensitizer is applied directly to the base and is not dispersed evenly in a 'carrier' layer that sits on top of the base. In a silver gelatin print, the light sensitive silver compounds are suspended in a layer of gelatin. In most hand coated alt processes (excluding albumen, in which the albumen is the carrier layer) the light sensitive compounds are applied directly to the base and are soaked up by the paper fibers.

  3. #13
    Aggie's Avatar
    Join Date
    Jan 2003
    Location
    So. Utah
    Shooter
    Multi Format
    Posts
    4,925
    Images
    6
    ..

  4. #14
    lee
    lee is offline
    lee's Avatar
    Join Date
    Nov 2002
    Location
    Fort Worth TX
    Shooter
    8x10 Format
    Posts
    2,913
    Images
    8
    so, does Websters have a gallery and a website?

    lee\c

  5. #15
    clay's Avatar
    Join Date
    Nov 2002
    Location
    Asheville, North Carolina
    Shooter
    Multi Format
    Posts
    1,118
    Images
    8
    Van dyke and platinum sensitizers are not colloidal solutions, they are saturated solutions. i stand by my statement

  6. #16
    Bruce Osgood's Avatar
    Join Date
    Sep 2002
    Location
    Brooklyn, N.Y. USA
    Shooter
    Multi Format
    Posts
    2,415
    Images
    42
    SNIP
    Quote Originally Posted by mvjim
    Also both RC and Fiber are considered Silver Gelatin.
    close snip

    Well, if you're right, it's brand new to me. I have seen exhibits where a distinction is made between "Silver Gelatin" and "Fiber Based" images; where P/P images are display they are duly noted as such.

  7. #17
    Aggie's Avatar
    Join Date
    Jan 2003
    Location
    So. Utah
    Shooter
    Multi Format
    Posts
    4,925
    Images
    6
    ..

  8. #18
    David A. Goldfarb's Avatar
    Join Date
    Sep 2002
    Location
    Honolulu, Hawai'i
    Shooter
    Large Format
    Posts
    17,135
    Images
    20
    I'm with mvjim. Both RC and fiber based B&W images are usually called "silver gelatin" in galleries and museums (unless, obviously, they are some other process). It is possible that in a gallery where prints are offered for sale, something may also be said about the substrate, but "silver gelatin" refers only to the emulsion.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  9. #19
    clay's Avatar
    Join Date
    Nov 2002
    Location
    Asheville, North Carolina
    Shooter
    Multi Format
    Posts
    1,118
    Images
    8
    1 : a gelatinous or mucinous substance found in tissues in disease (as in the thyroid) or normally
    2 a : a substance that consists of particles dispersed throughout another substance which are too small for resolution with an ordinary light microscope but are incapable of passing through a semipermeable membrane b : a mixture consisting of a colloid together with the medium in which it is dispersed

    Platinum and Van Dyke and cyanotype solutions do not contain particles- they are dissolved organic and metal salts in an aqueous solution that WILL pass through a semi-permeable membrane - I know because that is how I filter them when I make them up.

    I'm finished on this subject. I know quite enough to know I am right on the definition of an emulsion.

  10. #20
    Aggie's Avatar
    Join Date
    Jan 2003
    Location
    So. Utah
    Shooter
    Multi Format
    Posts
    4,925
    Images
    6
    ..

Page 2 of 4 FirstFirst 1234 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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