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  1. #201
    lesm's Avatar
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    As a latecomer to all this discussion, can I address the original OP? I also live in South Australia (known as the Driest State in the Driest Continent on Earth) and I've likewise struggled with my conscience as I contemplate building a darkroom in the next few months. The solution I've decided on, which may be of some use to you, perhaps, is to dedicate one of our rainwater tanks as my photography water supply. (I'll install appropriate filters). If it runs out in mid summer, that'll be a good time to go and shoot some more film until it rains again, or -GASP! - drag out the DSLR.

    I can't believe I just typed that.

    PE, has anyone ever explored the possibility of some kind of dry powder process instead of water?

  2. #202
    Steve Smith's Avatar
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    Quote Originally Posted by lesm View Post
    has anyone ever explored the possibility of some kind of dry powder process instead of water?
    http://www.imaginginfo.com/print/PTN...ocessor/2$1021

    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  3. #203
    lesm's Avatar
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    Wow! That's fascinating, Steve. So that technology is just sitting in a corner in a warehouse somewhere. Couldn't they at least sell it to Ilford or the Impossible Whatsit Project? I might just write to Messrs Kodak. Thanks for that.

    Love your website, BTW.
    Last edited by lesm; 09-19-2011 at 09:24 AM. Click to view previous post history.

  4. #204
    Photo Engineer's Avatar
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    This is dye sublimation printing for color originals. It has been in use by Kodak for years and is implemented in their small home printing dock. Heat is used to transfer digital images or scanned images onto a sheet of special paper from a sheet of meltable dye. It makes 4 passes by the heating head printing a C/M/Y/K image.

    OTOH, there are ways to reduce washing by chemical additives in the fix. These are expensive but useful.

    PE

  5. #205
    Steve Smith's Avatar
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    The process in my link was for processing of film:

    It is generally agreed, even by the early naysayers, that the system was a remarkable technical achievement. It did what it was supposed to do: process negatives without wet chemicals.

    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  6. #206
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    Ahh, I was looking at the print part. The one of the existing Kodak C41 processes does not wash the negative, but just renders them for scanning and then they are discarded. You get a wash free CD or DVD in that case and some prints. Some stores do wash the negative and do return them to the owner.

    AFAIK, there is no truly "dry" process except for the thermal processes and lamination processes, some of which were described by Haist.

    PE

  7. #207

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    ron

    would it be possible for someone use a trickle tank ( or something similar )
    so s/he does a primary wash in water that is "recycled"
    ( de-silvered wash water that went through the trickle tank )
    and used fresh water for a final "rinse / soak " ?

    thanks
    john

  8. #208
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    I am familiar with countercurrent washes, and I assume that this is similar. However, desivering the wash water and removing the hypo both will be the problem in what you describe.

    PE

  9. #209

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    yeah, i forgot about the hypo !

    too bad a good diatomaceous earth filtration system
    can't be used ... campers use them to filter water and make it
    potable, it would be great if one could be used to recycle used wash water,
    once the silver was removed ...

  10. #210
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    A mixed bed ion exchange resin + an organic absorbing resin will work. BTDT.

    PE



 

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