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  1. #11

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    At the proportions in the above recipe the Metol + Ascorbic Acid + Sodium Carbonate would make a decent developer on their own. I'm curious to see the difference without the Frisk tablets.

  2. #12

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    Hi guys, thanks for many comments.
    Yes, the recipe is functional without frisk (Menthol).
    Pyro developer uses a tint effect, which is happened to gives complexes of metal ion and (poly)phenol. For example, you may know deep color change when add honey to black tea.
    Also blue-black ink for fountain pen uses similar effect.
    The pyro-developing needs also conventional development for separation of silver metal.
    The tint effect accompanies with image density, so it gives fine image because of small silver grain size.

    I am a patent illustrator, but the recipe has not been applied for patent.
    Use freely and have a fun.

  3. #13
    Steve Smith's Avatar
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    Quote Originally Posted by holmburgers View Post
    Ahh, thanks for the clarification guys. I don't think we have Frisk mints here in the US.
    We don't have them here in the UK. I assumed they were from the US!


    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.

  4. #14

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    Quote Originally Posted by Patent_freak View Post
    Yes, the recipe is functional without frisk (Menthol).
    The question was whether thare is any developing activity without the metol and ascorbic acid. That is from just the Frisk tablets and carbonate. I seriously doubt that there is.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  5. #15
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    As I posted in another thread, neither menthol nor phenol are developing agents. Phenol is a weak coupler AAMOF. I think that the use of FRISK is a red herring unless there is some hidden ingredient in the tablets.

    PE

  6. #16

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    Whether a chemical is a developing agent or not depends on a set of conditions. For example, the chemical must contain either two hydroxyl groups (hydroquinone), or two amno groups (paraphenylenediamine), or a hydroxyl and an amino group (paraminophenol). This is what is called a necessary but not sufficient condition. How the two groups must be positioned is summarized by the Kendall-Pelz Rule. Catechol and hydroquinone are developing agents but resorcinol is not.
    Last edited by Gerald C Koch; 05-07-2011 at 01:38 PM. Click to view previous post history.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  7. #17

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    FRISK, Sharpens You Up!

    Just running through here quickly - it looks like the OP is saying that the use of FRISK MINTS converts the soup into a non-pyro staining developer.

    If so it might work just as well with other developer formulas....

    ?

  8. #18

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    Quote Originally Posted by Ray Rogers View Post
    Just running through here quickly - it looks like the OP is saying that the use of FRISK MINTS converts the soup into a non-pyro staining developer.

    If so it might work just as well with other developer formulas....

    ?
    Yes, exactly you are right.
    Other developer formuras will work with Frisk I think.
    But Sodium sulfite suffocate the staining effect.
    Pyro staining effect swells the basic developer characterisic, it is interesting.

    See my web site.
    Last edited by Patent_freak; 05-07-2011 at 09:52 PM. Click to view previous post history. Reason: miss spell

  9. #19

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    When I tried Caffenol-C briefly I found the variation I used had very little stain - apparently the ascorbic acid also reduces stain (according to people who've tested it more than I have). Not sure if this is Caffenol-specific, or applicable to all staining developers - ex, is there an advantage to using Frisk tablets vs. just using more ascorbic acid if the reduced staining is the desired effect?

    Incidentally, I haven't had time to compile/type up my results, but I did try using mint tea as a developer - it works as anticipated as a staining developer if very concentrated. Obviously, different compounds in mint tea vs. a Frisk tablet, though.
    i can't wait to take a picture of my thumb with this beautiful camera.

    - phirehouse, after buying a camera in the classifieds

  10. #20

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    http://www.altphotolist.org/lists/al...y2000/0537.htm

    Is the Mintol stain polymerised phenols characteristic of pyro?

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