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  1. #31
    gainer's Avatar
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    Now who's on that slippery slope?

    From what I have read, including "Theory of the Photographic Process", there are more things in nature that develop film than do not.
    Gadget Gainer

  2. #32

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    Quote Originally Posted by gainer
    Now who's on that slippery slope?

    From what I have read, including "Theory of the Photographic Process", there are more things in nature that develop film than do not.

    Yes, even human urine can reportedely be used to develop film. Anchell and Troop write that pyrocatechin is a constituent of human urine, and continue with this wonderful tongue in cheek statement. "How or why the human body manufacturers pyrocatechin is something we will leave to future generationss of scientists -- or theologians. Perhaps the Creator foresaw a time when developing agents would be in short supply but film would be plentiful?

    Sandy

  3. #33
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    I had hoped when I saw that the Tylenol formula gave results like Rodinal that the Tylenol would complete my quest for a grocery store developer. p-aminophenol is synergistic with ascorbic acid, but I haven't had any luck with acetaminophen and ascorbic acid. I should have known that when I saw that the antifog agents outweighed the developing agent.
    Maybe I should try hair dye. Some of them contain paraphenylenediamine.
    Gadget Gainer

  4. #34
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    Quote Originally Posted by sanking
    Yes, even human urine can reportedely be used to develop film. Anchell and Troop write that pyrocatechin is a constituent of human urine,
    Sandy
    There was a person on LUG( leica Users Group) that claimed a "Urinol"
    formula, with examples of photo done with it, but he never gave up the formula.
    "Just because nobody complains doesn't mean all parachutes are perfect."

  5. #35

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    Quote Originally Posted by garryl
    There was a person on LUG( leica Users Group) that claimed a "Urinol"
    formula, with examples of photo done with it, but he never gave up the formula.
    I have posted an example of an 8x10 Azo contact print, untoned, developed in Michael Smith's Azo/Amidol formulation. The developer was prepared with my stock concentrate of Amidol in a solution of Propylene Glycol. The concentrate was prepared about 4 weeks before use.

    The negative was Efke 100, semi-stand developed in a slosher tray with Pyrocat-HD.

    Lens: Barrel mount 305mm Apo Nikkor.
    Exposure: 20 seconds at f45 with my Polarfleece Sock Shutter.
    Tom Hoskinson
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    Everything is analog - even digital :D

  6. #36

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    Quote Originally Posted by Tom Hoskinson
    I have posted an example of an 8x10 Azo contact print, untoned, developed in Michael Smith's Azo/Amidol formulation. The developer was prepared with my stock concentrate of Amidol in a solution of Propylene Glycol. The concentrate was prepared about 4 weeks before use.

    The negative was Efke 100, semi-stand developed in a slosher tray with Pyrocat-HD.

    Lens: Barrel mount 305mm Apo Nikkor.
    Exposure: 20 seconds at f45 with my Polarfleece Sock Shutter.

    Tom,

    Are you mixing Michael Smith's Amidol formula as a concentrated stock solution and then diluting with water to make the working solution? I have read your previous description of this but am still a bit confused as to exactly how you are mixing the stock and working solutions. I would really appreciate it if you would describe this again as I would like to try this myself as it sounds like a much better way of working than having to mix the developer from scratch every time.

    Thanks in advance.


    Sandy

  7. #37

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    Quote Originally Posted by sanking
    Tom,

    Are you mixing Michael Smith's Amidol formula as a concentrated stock solution and then diluting with water to make the working solution? I have read your previous description of this but am still a bit confused as to exactly how you are mixing the stock and working solutions. I would really appreciate it if you would describe this again as I would like to try this myself as it sounds like a much better way of working than having to mix the developer from scratch every time.

    Thanks in advance.


    Sandy
    Sandy, this formulation has been evolving. Here is my current procedure:

    The basic formulation is Michael Smith's Azo contact paper developer formulation, so: 30 grams/liter sodium sulfite, 3 grams/liter citric acid, 2ml 10% KBr/liter. Michael’s Azo formulation calls for 8 grams/liter Amidol.

    I have determined that I can dissolve 8 grams of Amidol in 250 ml of Propylene Glycol (PG) at 140 to 160 degrees F. A very small amount of undissolved Amidol debris (typically a fraction of a gram) will be left that will eventually settle to the bottom of the container. This Amidol debris is water-soluble and has not affected the end results with the working developer. I have raised the PG temperature to 250 F and the debris remains insoluble – however, the debris dissolves easily in water at room temperature.

    I mix the Amidol stock solution under a vented laboratory hood on a combination hot plate/magnetic stirrer.

    MS Amidol Concentrate – Solution A

    Propylene Glycol at 160 deg F --------------------------900 ml
    Amidol --------------------------------------------------32 grams
    Stir until dissolved (some undissolved residue is normal)
    Propylene Glycol to -----------------------------------1000 ml

    MS Amidol Concentrate – Solution B

    Water at 125 deg F -------------------------------------800 ml
    Sodium Sulfite ------------------------------------------120 grams
    Citric Acid -----------------------------------------------12 grams
    10% KBr stock solution ------------------------------------8 ml
    Water to ----------------------------------------------1000 ml

    For working developer: Mix 1 part A + 1 part B + 2 parts water
    Tom Hoskinson
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    Everything is analog - even digital :D

  8. #38

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    One additional note. Increasing the amount of PG beyond 30ml PG per gram of Amidol had no apparent affect on the quantity of undissolved residue.
    Tom Hoskinson
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    Everything is analog - even digital :D

  9. #39

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    Tom,


    Is it not possible to mix all of the chemcials in one stock solution? I mean, amidol, bromide, sulfite and citric acid all in the same solution?

    Sandy

  10. #40

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    Quote Originally Posted by sanking
    Tom,


    Is it not possible to mix all of the chemcials in one stock solution? I mean, amidol, bromide, sulfite and citric acid all in the same solution?

    Sandy
    Yes, IMO it should be possible to put everything together in a single solution.

    I was just taking it one step at a time, to see if an Amidol concentrate was feasible at all.

    The obvious next step is to try combining everything into a single solution. I got a bit side tracked in this by investigating the amidol debris residue.
    Tom Hoskinson
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    Everything is analog - even digital :D

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