[pure-silver] Re: ISO 4 35mm Orthochromatic Direct Positive film

  • From: `Richard Knoppow <dickburk@xxxxxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Thu, 14 Oct 2021 11:45:52 -0700

   You are correct. I would develop a snip in something like Dektol and fix it out to see if there was edge printing. Also look for anything embossed along the edge.
   There were several direct positive films made, some for duplicating negatives, some for document copying. Some of these work on the principle of the emulsion being pre-fogged in a way that reverses the image for large exposures.

On 10/14/2021 11:35 AM, Dana Myers wrote:

Edge-printing is just exposure that occurred at the factory, right? Fixing it without developing would remove all the silver, unless I'm mistaken.

Dana  K6JQ


On Thu, Oct 14, 2021 at 11:31 AM Tim Daneliuk <dmarc-noreply@xxxxxxxxxxxxx> wrote:

    On 10/14/21 1:04 PM, Nicholas O. Lindan wrote:
    > First I would try and find out what film it is - snip off
    a bit and develop in AOS (any-old-shite) developer to see
    if there are edge markings.

    Well ... just fixing it would that, right ;)

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Richard Knoppow
dickburk@xxxxxxxxxxxxx
WB6KBL

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