Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,516   Posts: 1,543,737   Online: 881
      
Page 4 of 4 FirstFirst 1234
Results 31 to 36 of 36
  1. #31

    Join Date
    Apr 2005
    Location
    San Bernardino, CA
    Shooter
    8x10 Format
    Posts
    734
    Guys,
    I must admit that I now feel foolish for starting this thread on a subject about which I know little.(Dye Transfer) That takes care of the Matrix Film as far as I am concerned. On the other hand, Jim's idea of loading pigment into panchro emulsions, be they gelatin or polymer based, is still of great interest to me. After I make my next batch of emulsion I will do some initial testing using commercial pigment despersions. If that works out, great. But if light transmision proves to be a problem, I have many years of "proffesional" experience in pigment dispersion for for photoresists. I am familiar with what Drew is talking about. I might actualy purchase a benchtop three-roll mill.
    Once I have begun I will begin posting results here. But. That will be at least three weeks from now.
    OTOH , someone could decide to pursue matix film and receiving medium based on gelatin emulsions. Why not?
    Jim already has the matrix formula published. Bill

  2. #32
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,015
    Images
    65
    Quote Originally Posted by holmburgers View Post
    This sounds like a very good assessment of the situation, specifically regarding the amino groups. Not something I know much about, but definitely, the DT mechanism relies on a special relationship between certain types of dyes & gelatin protein.

    And regarding, That is certainly my understanding as well. I've transferred magenta dye to a fixed-out (non-hardening) FB paper and the density is very good, but diffusion is terrible! The mechanism of imbibition though, relies on this pH gradient and not a mordant.

    Speaking of which... you can buy thorium nitrate on eBay for fairly low prices. Not that I'm even considering such an endeavor..
    Read the responses I posted and that Jim Browning posted.

    PE

  3. #33
    holmburgers's Avatar
    Join Date
    Aug 2009
    Location
    Rochester NY (native KS)
    Shooter
    Multi Format
    Posts
    4,420
    Images
    2
    I always read what has been posted by you two, and I didn't mean to gloss over it in my post. I do think, though, that it's the gelatin-to-gelatin transfer that should be considered the "fundamental" mechanism. To me it seems like the mordanting aspect is an improvement, not an embodiment of dye-imbibition itself, which can be demonstrated in the simplest form with a gelatin relief, dye and any absorbent surface.

    So as far as Bill is concerned, the crux is whether PVA will act similarly to gelatin in its ability to absorb a dye solution, and that's what T-grain was addressing originally.

  4. #34

    Join Date
    Apr 2005
    Location
    San Bernardino, CA
    Shooter
    8x10 Format
    Posts
    734
    Hello All,
    Since I,prematurely at best, started this thread, I have read much speculation and no hard evidence. I should have done some experiments. Then either opened my big mouth,or not.
    When I first started my goal of making a panchromatic emulsion, I got more discouragement than encouragement, to say the least. When I started using silane treated PVA instead of gelatin , the same. Fortuneately, I kept going anyway.
    I am not saying that the reasons set fouth in this thread, for the inpractability of of what I asked about are not correct. They probably are correct. That is why I am puting this whole topic away, for now. And I have more promissing things that I can do with my time. If I ever decide to pursue anything having to do with dye transfer, I might well return to gelatin in order to work with what has already worked.
    Bill

  5. #35
    holmburgers's Avatar
    Join Date
    Aug 2009
    Location
    Rochester NY (native KS)
    Shooter
    Multi Format
    Posts
    4,420
    Images
    2
    At the risk of saying too much (which I'm wont to do), I'll simply add that regardless of the workability your proposal, the proposal itself has sparked a valuable discussion.

    Sometimes the most interesting stuff comes about when people speak before they think, contrary to what countless elementary school teachers and mothers have always told us!

  6. #36

    Join Date
    Apr 2005
    Location
    San Bernardino, CA
    Shooter
    8x10 Format
    Posts
    734
    Jack Denim as just posted a very relavent artical on Jim's Yahoo Forum "Dye Transfer.
    Bill

Page 4 of 4 FirstFirst 1234


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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