[Jewelry making - Article 00292] - Re: [Orchid] Phototetching

[Peter W . Rowe]

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>            Does anyone know of a product for a resin photoresist that
>     is exposed, then developed? I've googled many of the iron on kind,
>     but this just won't pick up the detail of a photograph. 

    Karen, the old standby, before the easy iron on products, was Kodak
    KPR photoresist.  It's a liquid.  While liquid, stored in a brown
    bottle, it's not expecially photo sensative (but don't store it out
    in the sunlight.).  You get your plates properly clean (water sheets
    off, etc.), and dry.  Coat the plates with the liquid, and hold then
    vertically to drain, giving the thinnest possible layer.  Do the
    coating and drying, and subsequent handling, either in darkness, or
    a standard red light photo safe light environment.  Drying is speeded
    with a drying box, which amounts to warm air from a hair dryer blown
    into the box in which the plates are standing up on edge.  After
    drying,  handle only in darkness or subdued red safelight
    conditions. Place your hight contast negative emulsion down to the
    plate, and clamp in an exposure frame for exposure.  Traditionally,
    exposing is done in commercial units using arc lamps, but sun lamps,
    or even sun light will work.  You'll have to figure out exposure
    times by trial and error if not using commercial exposure setups. 
    Then, in the red safelight environment again, develop the plates with
    Kodak KPR developer, or another compatible developer (there are
    several), allow the developed and washed plates to again dry, to
    harden the resist layer, and you're ready to etch.  Done well, this
    material is capable of holding microscopic details (Not sure if it is
    still used in semiconductor manufacture, but at one time, it was. 
    Certainly, you can do plates that will print a high resolution
    halftone image with ease.) 

    I last used this stuff in grad school, in the late 80s, so I cannot
    help you with a current source, and it's not likely to be a local
    camera supply store item. Might be in a commercial graphic arts
    place, and certainly is still available from the sorts of
    commercial/industrial suppliers that would carry such things.
    Whether you can find that just on the web, I don't know, since it's
    not generally a consumer level item.  You might try the Thomas
    Register site, or just call Kodak to find a distributor near you. 

Peter

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