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  1. #1
    Lukas_87's Avatar
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    Ing. Koblic MPB (outdated film developer)

    during and after W.W.II. photographers in the Czech Republic suffered from lack of fresh films - in fact one wasn't able to buy anything else than outdated film or paper. famous photography-oriented Czech inventor and chemist Ing. Premysl Koblic (aside from his famous Pextral developing method) formulated a special developer intended to use with outdated films.
    so it's time to tell the whole world about it .)

    Metol - 4 g
    Sodium sulfite (anhydrous) - 16 g
    Disodium phosphate (.12H2O) - 4 g
    Borax (sodium tetraborate) - 8 g
    water to make - 1000 ml (pH should be 8.5)

    developing time suggested for the first film is around 8-15 min at 18 °C.
    should be stored up to 6 months (and maybe more).
    used developer can't be stored.

    amount of Disodium phosphate can be altered up to 70 g/l - it acts as a restrainer of a fog&haze and other negative effects of long-time stored film.
    film's speed will be slightly better than D-76 and negatives will be very sharp, fine grained, gelatine layer is very clear. prints should look crisp and sharp without annoying edge-effects caused by many actuance developers.

    Delta 400 negatives have as good tonality as souped in DD-X but are super-sharp (can be seen even on 5x enargements as a huge difference).

    btw - it can be diluted 1+1 with approximately doubling the development times, giving more compensation. using at higher temperatures than 20 °C cannot be recommended because of metol's soft-working nature.
    btw2 - concentrated (3x ?) solution to be diluted before use can be made easily.

    some sample shots from delta400 @ mpb 1+0 are attached. scanned enlargements from ilford mg iv rc and adox easy print in dektol made with condenser enlarger.

  2. #11
    MPandolfo's Avatar
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    Quote Originally Posted by Lukas_87 View Post
    ... don't know where I had my brain when I wrote that
    possibly you smoked some of Daniel's plants ?
    Last edited by MPandolfo; 01-06-2010 at 05:54 PM. Click to view previous post history. Reason: typo
    Marcelo
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    The harder I work, the luckier I get.

  3. #12

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    in my country Indonesia, it's hard to find Disodium phosphate, can change it to trisodium posphate?

    thanks
    haryanto
    Last edited by haryanto; 04-15-2010 at 10:49 PM. Click to view previous post history. Reason: typo
    quiet-light.blogspot.com

  4. #13
    Lukas_87's Avatar
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    Quote Originally Posted by haryanto View Post
    in my country Indonesia, it's hard to find Disodium phosphate, can change it to trisodium posphate?

    thanks
    haryanto
    as far as I know, 1 % solution of TSP has pH of 12,1.
    compared to pH around 9 of 1 % solution of disodium phosphate (smewhere it's said it is neutral).
    maybe it can be substitued, but then you have to adjust the pH by adding some acid. i'm not a chemist, sorry.

  5. #14
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    Hallo- I just JOINED this Venerable Site ! I love mixing my own ever since 1951 when the School Chemistry Master showed members of the School Photo-Soc how to mix up developers ! I tried this Formula today with some 1992 dated Kodak TMY 400 I downrated to 250ASA -- I mixed a x3 concentration, then I diluted it 1+3 with water -- was my maths corect as the test length of 120 film was severely under-developed at 10 minutes (guessed time) and I was careful to use 18oC not the usual 20oC. Regards to all the Experts on here, from Darkest Essex, England -- Peter.
    An 'Old Dog still learning New Tricks !

  6. #15
    fotch's Avatar
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    Hello pentaxpete and welcome to APUG.
    Items for sale or trade at www.Camera35.com

  7. #16
    pentaxpete's Avatar
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    I did the other half of the cut 120 film-- this time I rated the film at 200ASA and gave it 17 minutes instead of 10 minutes -- result -- better, but still a bit 'thin' and I think it needs at least 18 minutes dev time and rate at 160 ASA.
    An 'Old Dog still learning New Tricks !

  8. #17
    Lukas_87's Avatar
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    hello, for 3x concetrate you should make up the working solution by diluting it 1+2 with water (1+2 dilution = 1:3 = 1/3 concentration). however, don't be afraid to prolong the development further, this developer is softly working. maybe you will have to add more Disodium phosphate to it for 18 years old film (10-20 g maybe, maybe more).
    good luck.

  9. #18
    pentaxpete's Avatar
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    Dear Mr Lucas : many thanks -- your MATHS is much better than mine ! I asked my boy and HE said it should be 1+2 not 1+3 as I worked out -- I am experimenting more with the developer, will try with some other films -- the FOG level on my outdated TMY 400 was very low , so looking promising ! ( just one worry -- MY bottle says 'Disodium Hydrogen Phosphate' -- is it the same as the ordinary 'Disodium Phosphate' ? )
    Last edited by pentaxpete; 09-26-2010 at 06:00 AM. Click to view previous post history.
    An 'Old Dog still learning New Tricks !

  10. #19
    Lukas_87's Avatar
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    I think it should be all right as long as your Disodium Hydrogen Phosphate is Na2HPO4 . 12H2O (CAS: 10039-32-4). It's the same I think (or hope).

    Best Regards from the Czech Republic!

  11. #20

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    I have nothing to say except thank you to the contributer.

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