TD-3 formula

Discussion in 'B&W: Film, Paper, Chemistry' started by Ole, May 8, 2003.

  1. Ole

    Ole Moderator Staff Member Moderator

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    The green tone might indicate pyrocatechin, I think. It could well be a derivative of TD-103 as described in "The Film Developing Cookbook".

    Just a few idle thoughts - no hard knowledge.
     
  2. edbuffaloe

    edbuffaloe Member

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    I agree--it is almost certainly a pyrocatechin-based compensating developer.
     
  3. fhovie

    fhovie Subscriber

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    I have used TD3 a lot over the last year and never thought of it as a staining developer. There are no instructions about avoiding acid or adding an alkali after soak or a specific wash time to set a stain. I have never observed any color cast as well. I do know that it has worked better for me than Technidol. I like the stuff.
     
  4. fhovie

    fhovie Subscriber

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    I'll have to pay closer attention next time - thanks for the info. i made an interesteing discovery last month when I accidentally processed some Techpan in some split D23. The results were quite good. Still probably N+1 or more but very printable - good film speed - nice Tech-pan grain structure. In case you don't know the brew it is

    Part A
    1 Liter water
    85 g Sodium Sulfite
    6.25 g Metol

    Part B
    1 Liter water
    12 g Sodium Metaborate

    4 minutes in A and 4 in B - nearly any emulsion, standard agitation, wide temperature tolerance - no wash between stages - does about a dozen rolls of film for less than $3.

    You can get the chems for photoformulary.com

    Frank