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Thread: Actual formula for Pyrocat HD A and B solutions

  1. #1
    Steven Ruttenberg's Avatar
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    Actual formula for Pyrocat HD A and B solutions

    I am looking at Sandy Kings write up on mixing and the ingredients he lists do not match the ingredietns listed on Photographers Formulary site. I would like to try mixing my own from scratch. Are they just using different names? I am also trying to exchange my liquid they sent for the dry version as well.

  2. #2

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    Re: Actual formula for Pyrocat HD A and B solutions

    I was referred to this site. I just ordered the chemicals from art craft chemicals to mix my own.

    http://www.pyrocat-hd.com/html/mixing.html

  3. #3

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    Re: Actual formula for Pyrocat HD A and B solutions

    Quote Originally Posted by Steven Ruttenberg View Post
    I am looking at Sandy Kings write up on mixing and the ingredients he lists do not match the ingredietns listed on Photographers Formulary site. I would like to try mixing my own from scratch. Are they just using different names? I am also trying to exchange my liquid they sent for the dry version as well.
    Use Sandy's list. I have had trouble with Pyrocat fromPF.

  4. #4

  5. #5
    Steve Sherman's Avatar
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    Re: Actual formula for Pyrocat HD A and B solutions

    Copied below is the exact formula that I have used since 2002 or there abouts. The Phenidone does not dissolve in water so it is recommended and I have done for years to dissolve Phenidone in a small amount of alcohol and then add to the rest of the solution, it works fine that way. The B component, Potassium Carbonate is also difficult to get into solution, add very slowly and be patient it will eventually all go into solution. Stored in brown stopper bottles A will last close to a year while B will
    Last indefinitely

    Part A
    Distilled Water (50¡ C) 750 ml
    Sodium Metabisulfite 10 g
    Pyrocatechin 50 g
    Phenidone 2.0 g
    Potassium Bromide 1.0 g
    Distilled Water to make 1000 ml

    Part B
    Distilled Water 750 ml
    Potassium Carbonate 750 g
    Distilled Water to make 1000ml


    Real photographs are born wet !

    www.PowerOfProcessTips.com

  6. #6

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    Re: Actual formula for Pyrocat HD A and B solutions

    I use the same formula as Steve and mix up the same way, except I use propylene glycol for the A solution. Worked this way for many years without issue.

  7. #7
    Steven Ruttenberg's Avatar
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    Re: Actual formula for Pyrocat HD A and B solutions

    That is the formula I am looking at now. Considerably different from PF. I am gonna order chemicals this week and make up a small batch.

  8. #8
    Old School Wayne
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    Re: Actual formula for Pyrocat HD A and B solutions

    Quote Originally Posted by Steven Ruttenberg View Post
    I am looking at Sandy Kings write up on mixing and the ingredients he lists do not match the ingredietns listed on Photographers Formulary site. I would like to try mixing my own from scratch. Are they just using different names? I am also trying to exchange my liquid they sent for the dry version as well.
    Actually the only difference between the 2 is sodium bisulfite vs metabisulfite which is no difference at all because meta become bi in solution. Formulary has the ingredients for Crawley's FX-1 figure prominently on their Pyrocat HD page for some reason, but if you click on the "Tech Info" link a pdf pops up that gives the exact same recipe as Sandy. Which makes sense, since he invented it.

  9. #9

  10. #10
    Cor's Avatar
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    Re: Actual formula for Pyrocat HD A and B solutions

    I have been mixing most of my developers my self for ages, including PyrocatHD in glycol. For whatever mysterious reason a couple of years ago I got a white precipitate in the A solution, and could not get it working again (that is: the developer did still work, but I could not get the preciptate in solution again, and that worried me). I switched to PyrocatHDC, almost identical, and no problems since than...

    Good luck,

    Cor

    Cor

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