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  1. #1

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    Crawley's FX-37 Developer for T-Max/Delta Films

    This developer is intended for use with T-Max and Delta films, although it will produce excellent results with traditional emulsions. FX-37 is designed to produce very sharp, tonally rich negatives with an EFS speed increase. It is not a fine grain developer and is not recommended for fast traditional films.

    Increase the EFS by one-half to two-thirds of a stop.

    Distilled water (50ーC) ................. 750 ml
    Sodium sulfite (anhy) .................. 60.0 g
    Hydroquinone ........................... 5.0 g
    Sodium carbonate (anhy) ................ 5.0 g
    Phenidone .............................. 0.5 g
    Borax .................................. 2.5 g
    Potassium bromide ...................... 0.5 g
    Benzotriazole, 1% ...................... 5.0 ml
    Distilled water to make ................ 1.0 l

    All times are for the 1+3 dilution at 20 C. For increase speed dilute 1+5.


    覧覧覧覧覧覧覧 EI Min 覧覧
    Fuji Neopan 400 500 6
    Neopan 1600 1600 5
    覧覧覧覧覧覧覧覧覧覧
    Ilford Delta 100 160 8シ
    Delta 400 500 7ス
    Pan-F Plus 64 4
    FP4 Plus 160 4ス
    HP5 Plus 640 6ス
    覧覧覧覧覧覧覧覧覧覧
    Kodak Plux-X 200 5ス
    T-Max 100 Pro 125 8
    T-Max 400 Pro 500 9
    T-Max 400 Pro 400 8
    T-Max 3200 1600 8
    Tri-X 500 6


    Crawley stated that FX-37 is the closest published formula to FX-39

    The benzotriazole can be eliminated if the bromide is increase to 1 g/l.

    I have not tried this formula as I do not use either of the two classes of film mentioned. I include it here because some people do like these films.

  2. #2
    Sean's Avatar
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    Comments from previous article system:

    By Rlibersky - 11:39 AM, 07-20-2006 Edit Rating: None
    I have used this formula with Plus-x @100ASA, Bergger @100ASA and Ilford 3200 @1600 with excellent results. Especially with the Ilford 3200. The finest grain I've seen.
    By aligndont - 07:20 PM, 09-02-2006 Edit Rating: None
    I've notice that if you use this developer at 24c and alter developing times as per time/temp converter in massive developing page then you have an exceedingly sharp fine grain developer.
    By craigclu - 05:41 AM, 09-04-2006 Edit Rating: None
    I've finally been getting at some testing for a speed enhancing (or at least attaining rated ISO's) developer. I tested a few things in this today and was pleasantly surprised at the fine grain, too. I got slightly over-developed results with the above times/temps and likely will try moving to 1:5 and see what the grain looks like and get more controllable times. Is anyone else using this and can share some results?
    By Rob Archer - 06:03 PM, 09-13-2006 Edit Rating: None
    How important is it to use distilled water - if so why? (i'm not a chemist!)

    Rob
    By Gerald Koch - 06:15 PM, 09-13-2006 Edit Rating: None
    The formula, as published, does not contain any calcium chelating agent. Attempting to add one may throw the pH of the solution off. I recommend using distilled water for all stock solutions of any developer and in this case also for the working solution.

    The calcium hardness in tap water can precipitate out onto the film surface as a whitish scum. Using distilled water prevents this.
    By pauldc - 07:30 PM, 09-13-2006 Edit Rating: None
    How do you convert the suggested times from 1:3 to 1:5? I have just made some FX-37 up and am ready to give it a go with Pan F. Also, are there advantages to grain size in going to the 1:5 dilution? And I am assuming that 1:5 means 1 part developer to 5 parts water. Cheers, Paul
    By Gerald Koch - 07:59 PM, 09-13-2006 Edit Rating: None
    I would try 1.5 times the 1+3 times.

    As with most developers of this type, the greater dilution should produce increased acutance with a slight increase in grain.

    BTW, I actually listed the dilutions as 1+3 and 1+5 to avoid use of the rather ambiguous colon notation such as 1:3.

  3. #3

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    Geoffrey Crawley wrote (Amateur Photographer 17 Feb 07) to the effect that the sharpness of FX-37 is the result of the combination of borax and carbonate as alkalis.The carbonate beefs up the the softness given by the borax without a noticeable increase in grain.This is helped by the milder solvent effect of the reduced sulfite content.The formula could be described as a "sharpened-up" D76 with phenidone instead of metol.

  4. #4

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    I've used a little of this developer, and it worked fine. I don't buy the speed increase, though. If there is one over comparably dilute D76, it is negligible, as in less than 1/3 stop. At least that was the case in my system with the films I tried, TMX and TMY.

  5. #5
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    I have been using this stuff at 1+5, 68ー F. to develop Tmax 100.. I just love it, sharp with good gradation, economical and the stock keeps very well..Evan Clarke

  6. #6

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    FX-37 with bromide only

    Here is what Geoffrey Crawley wrote about FX-37 made up with 1g/L potassium bromide and no benzotriazole, taken from Amateur Photographer 15 Oct 2005:
    "The only difference between this and the original FX-37 formula is the increase of potassium bromide from 0.5g to 1g and the consequent omission of benzotriazole,which is difficult to dissolve-a move to help the amateur.That chemical was originally included for the conditions of professional reuse as fog levels can rise.The change has no effect on image quality."

  7. #7
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    If I were to try FX-37, I would (what else?) put the phenidone and hydroquinone in a separate solution with glycol as solvent so that the working solution would be x*A + y*B +C*H2O. Sooner or later, I would substitute ascorbic acid for the hydroquinone and use TEA or a mixture of TEA and glycol in place of the glycol.

    Was not FX-39 the aborted venture into ascorbate? Or am I thinking of some other FX?
    Gadget Gainer

  8. #8
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    I've been trying it with D3200 to good effect-15 mins 1+5 24C at 3200.Only tried a few rolls of 120 so far but looks promising.Gainer-you were thinking of FX-50 BTW.
    "He took to writing poetry and visiting the elves: and though many shook their heads and touched their foreheads and said 'Poor old Baggins!' and though few believed any of his tales, he remained very happy till the end of his days, and those were extraordinarily long "- JRR Tolkien, ' The Hobbit '.

  9. #9
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    Quote Originally Posted by Peter De Smidt View Post
    I've used a little of this developer, and it worked fine. I don't buy the speed increase, though. If there is one over comparably dilute D76, it is negligible, as in less than 1/3 stop. At least that was the case in my system with the films I tried, TMX and TMY.
    With 1+5 FX37, I rate my 100 Tmax at 100 instead of 80 for other developers and I don't think it will do any more...Evan Clarke

  10. #10

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    From Amateur Photographer 27 August 2005,with their acknowledgements to Geoffrey Crawley for his answer:
    "Below is a guide to development times(for FX-37) of some popular emulsions when rated at their nominal ISO speeds.The developer should be at 20C and used at 1+3 dilution.Agitation should comprise four tank inversions per minute:
    (Extract):
    APX 100 5 mins, Acros 100 7mins, Pan F+ 4 mins, FP4+ 4.5 mins, Delta 100 7.5 mins, 400 Delta 8 mins, T-max 100 8 mins, T-max 400 7 mins."

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