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  1. #1
    htmlguru4242's Avatar
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    I got a set of Autochrome plates today!!

    My set of two 4"x5" Autochrome plates arrived in the mail today. I washed the emulsion off of one of them, to see the starch mask. The first thing that struck me was how easily the emulsion washed off of the plate; with some warm water and rubbing, it detached very easily.

    So anyway, the screen plate is very interesting. It has a very easily visible random set of grains, and has a reddish-purple-gray look to it; it is NOT quite neutral. The plate almost looks like it was done on an inkjet printer; it is perfectly smooth, though vertical lines are visible on it.

    The plate is translucent; it is quite far from transparent, so that answers one of my questions.

    I'm going to try to coat it with some liquid emulsion; I know that this isn't going to give great results (no red), but we'll see.

  2. #2

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    autochrome plates

    Hi,

    Did you find a couple of old, original plates? Or is there somewhere to buy new ones?

    Dave

  3. #3
    htmlguru4242's Avatar
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    They are [very] old and quite original!

    Unfortunately, they're exposed :-(

  4. #4

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    wow this is fascinating...

    I wonder what kind of results you could get using a mask made just using ektachrome...or printing a transparency out from your computer...might be easier than starch grains...

  5. #5
    AgX
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    In those days systems with separate grid masks had been developed. However the integrated grid mask systems (Lumiere, Agfa and Polaroid) were more versatile.

  6. #6

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    thanks...I'm just trying to think of a way to experiment that's not tooo much of a pain for a basement tinkerer like me

  7. #7

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    Look up Jolly or Dufay Color; it used a RGB reseau (matrix) printed on clear base by a greasy-resist method.

    You might be able to recreate the reseau with clear mylar and a very high resolution dot matrix printer, but that is pure speculation on my part...

    In any event, here are some good resources; http://www.infography.com/content/112904364761.html

    Also, the best reference I ever found on Dufay was the 1936 edition of "Colour Cinematography"

    Be prepared to say "OUCH" when purchasing...

  8. #8
    AgX
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    Yes DarkroomExperimente, I just threw in a historic remark.

    But keep in mind that those grids are really miniature. Recently I held a separate grid screen in hand (about 6x9 cm, Finlay I guess). With the unaided eye just a very,very faint rose tint was to see. I had to look at the cutting edge to realize the tint was caused by some sort of varnish. Even with the aid of a loupe I took me a lot of strain to see a, regular, grid structure, only then realizing what I held in hand!
    One figure I got on a different grid screen is 1,800 grid-points per mm²...
    Last edited by AgX; 12-16-2007 at 06:26 PM. Click to view previous post history.

  9. #9

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    that's amazing

    after making developers from plants from the garden, it somehow seems appropriate that I should try to work with potato-based color film...doesn't seem easy, but it's tempting

  10. #10
    AgX
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    Don't forget the edible lens...

    And when bying film we should no longer ask for speed but for taste.

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