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  1. #1

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    Mintol developer

    Introduce a new Pyro-developer, which contains Menthol as Phenol.
    Metol 0.1g
    Ascorbic acid 0.3g
    Sodium Carbonate (monohydrate) 3g
    FRISK (trade name) 5tablets
    to dissolve in 600ml water at 20degree(C).
    This solution have no shelf life, so you should use immediately after dissolving.

    Example posted used Tri-X at EI(exposure index)=400.
    Agitate condition; continuously initial 30s, and 5s in every minute.
    Total developing time is 14minutes at 20C.

  2. #2
    Vlad Soare's Avatar
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    What's so "pyro" about it? Is there any pyrogallol in Frisk tablets?

  3. #3

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    Two questions:

    What compound in the Frisk tablets are you claiming to have developer activity?
    Does your developer without the metol and ascorbic acid exhibit any developer activity?
    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

  4. #4
    Murray Kelly's Avatar
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    OK - menthol is a recognised 1 hydroxyl developing agent but you cloud the issue with metol somewhat. I accept that ascorbate is a regenerator but at carbonate pH (~11.5) it is a developer in its own right.

    What happens at lower pH levels?

    An interesting source of Menthol, reminding me of Panadol/Rodinal formulae.

  5. #5
    holmburgers's Avatar
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    Can I assume by your name 'Patent Freak' and the nature of this post that you've developed this Frisk tablet? Is it proprietary or have you patented it?

    I'm interesting in how to make dry powder developer formulas into tablets. I've started this thread on the topic.
    If you are the big tree, we are the small axe

  6. #6

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    Holmburgers, Frisk makes breath-freshening tablets and gum and stuff. I guess that's Patent Freak's source of Menthol.

  7. #7
    Steve Smith's Avatar
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    I looked this up earlier today as I had not heard of Frisk either. The Frisk mint ingredients are:

    Sweeteners (sorbitol, aspartame, L-phenylalanine compound), fragrance, sucrose esters, silicon oxide fine.

    I assume it's the L-phenylalanine which is the active ingredient in the developer.


    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.

  8. #8
    holmburgers's Avatar
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    Ahh, thanks for the clarification guys. I don't think we have Frisk mints here in the US.
    If you are the big tree, we are the small axe

  9. #9

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    You can find Frisk at our airports.

    Peter Gomena

  10. #10

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    I would not expect menthol to be an active developing agent. Its chemical structure and properties are totally unlike phenol. Phenylalanine, similarly, has no structural features that would provide developer activity.

    Jerry Koch's idea (to conduct control experiments) is correct -- are these mints actually doing anything?

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