Ferri - how do I get it?

Discussion in 'B&W: Film, Paper, Chemistry' started by tkamiya, Mar 17, 2011.

  1. tkamiya

    tkamiya Member

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    I want to try bleaching B&W prints with Ferri. It appears Kodak's version is no longer available. What's available from Photographer's formulary as Farmer's reducer II is a two solution version.

    Can I just buy some Potassium ferricynide?? Is that what Kodak's version was? PF's version is a compound, not just ferri.
     
  2. Mark Fisher

    Mark Fisher Subscriber

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    artcraftchemicals.com or bostick and sullivan is where I go.
     
  3. fschifano

    fschifano Member

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    If you want a rehalogenating bleach, then you need potassium ferricyanide and potassium bromide. Be advised that the metallic silver turned back into halides must be removed with fixer after treatment. If you want a farmers reducer, then you need some thiosulfate in the bleach to remove the halides as they are converted. I prefer to use the plain bleach and refix method for two reasons. First, the process is reversible until you refix the print. If you've overdone the bleach, you can always redevelop the print to get it back. Second, farmers reducer has no shelf life. Use it once and it's pretty much done. A rehalogenating bleach alone has a shelf lif of at least a couple of months without any significant weakening.

    Plenty of recipes around the net for both types of bleaches if you look for them. They're all pretty much the same. Some are more concentrated than others and with varying ratios of pot. ferri. to bromide, but they all work the same in the end. Dilute to the strength you need to get the job done.
     
  4. Gerald C Koch

    Gerald C Koch Member

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    www.techcheminc.com sells both potassium ferricyanide and potassium bromide. Prices are reasonable.
     
  5. tkamiya

    tkamiya Member

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    So the suggestion is to mix it myself from raw chemicals? I looked at instructions for Farmer's and then compared it against Kodak's. Appears "solution A" from FB is identical to Kodak's and "solution B" really is a fixer to mix with A. Interesting....
     
  6. holmburgers

    holmburgers Member

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    I have Kodak's Farmer's Reducer and it is a two part solution; potassium ferricyanide and sodium thiosulfate (hypo). That's Farmer's Reducer.. in other words, that is the reducer that Farmer discovered and has been in use for many, many years.

    I'm sure that the PF version is just fine, or you can go raw, but either way it's just 2 things and I'm sure PF doesn't mark it up that much; probably more of a convenience packaging.