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  1. #1
    Bob Carnie's Avatar
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    Bleaching Prints

    Quick question, if I want to bleach a print dramatically , will a wash and then double fix, hypo clear be enough to then hold the action of the bleach , then tone.
    much like spot bleaching but in this case I am bleaching the whole print to punch out the highligts??

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    Bob, that's been my experience.

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    Dan Henderson's Avatar
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    wouldn't that produce the same effect as using Farmer's Reducer? If I understand it correctly, Farmer's has bleach and fixer so that the bleached image cannot be redeveloped?


    web site: Dan Henderson, Photographer.com

    blog: https://danhendersonphotographer.wordpress.com/

    I am not anti-digital. I am pro-film.

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    Ian Grant's Avatar
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    That's fine Bob.

    Using Farmers reducer as opposed to a ferricyanide/bromide bleach is quite different in the way the bleach acts Dan. The Ferri/Bromide bleach works on the highlights first, while Farmers reducer works on the shadows as well.

    Ian
    Last edited by Ian Grant; 10-01-2010 at 07:25 AM. Click to view previous post history.

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    Bob Carnie's Avatar
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    thanks folks

    I want to work on the highlight region only and keep the blacks super black.
    Ian I want a very strong bleach effect as I need to bump up the highlights dramatically as I am making solarized prints where the highlights are too muddy for my taste .
    any suggestions on the dilution ratios that would work well I am using Ferri/Bromide currently at 32grams each to 12 litres of water.?
    I do not want to reach the shadows.
    Quote Originally Posted by Ian Grant View Post
    That's fine Bob.

    Using Farmers reducer as opposed to a ferricyanide/bromide bleach is quite different in the way the bleach acts Dan. The Ferri/Bromide bleach works on the highlights first, while Farmers reducer works on the shadows as well.

    Ian

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    RalphLambrecht's Avatar
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    Quote Originally Posted by Dan Henderson View Post
    wouldn't that produce the same effect as using Farmer's Reducer? If I understand it correctly, Farmer's has bleach and fixer so that the bleached image cannot be redeveloped?
    Dan

    That's correct. Farmer's Reducer is nothing but potassium ferricyanide (bleach) plus fixer. Using them together or sequentially has the same effect.
    However, the mixture has the benefit that one can immediately see the bleaching progress. Unfortunately, it is not very stable due to a chemical reaction between ferri and fixer, causing it to lose its entire strength within 10-15 minutes.


    Ian

    What is a ferricyanide/bromide bleach?
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

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    The Ferricyanide/Bromide bleach (and others) will allow redevelopment if things go too far but colours may change
    Mark
    Mark Layne
    Nova Scotia
    and Barbados

  8. #8
    Ian Grant's Avatar
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    There's too many variables Bob. However a 100g/litre of each diluted 1+10 works very fast, that's 10g/litre, your talking a touch under 3g/litre, I'd start by diluting that a further 1+9 (1:10) so you have about 3g/litre Ferricyanide & KBr

    One nice point about using this bleach is if it goes too far, you just wash and re-develop, the room light is usually sufficient to re-expose the bleached emulsion.

    Ian

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    My suggestion about bleaching is to do it gradually. You can always bleach more, you can't unbleach. I follow Ralph's suggestion and mix fresh or add potassium ferricyanide if it is too weak. I don't often bleach but it is a good idea to have at least one backup print just in case.

    http://www.jeffreyglasser.com/

  10. #10
    Ian Grant's Avatar
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    Quote Originally Posted by RalphLambrecht View Post
    Dan

    That's correct. Farmer's Reducer is nothing but potassium ferricyanide (bleach) plus fixer. Using them together or sequentially has the same effect.
    However, the mixture has the benefit that one can immediately see the bleaching progress. Unfortunately, it is not very stable due to a chemical reaction between ferri and fixer, causing it to lose its entire strength within 10-15 minutes.


    Ian

    What is a ferricyanide/bromide bleach?
    A Potassium Ferricyanide/Potassium Bromide bleach is a re halogenating bleach, more usually used for toners.

    For artwork and complex reduction it's sometimes more useful than Farmers.

    Using Potassium Ferricyanide on it's own followed by fixing is quite different in effect to the action of Farmers Reducer.

    If you add ferricyanide to commercial fixer it's an agressive bleach particulary if the fixer is ammonium thiosulphate based. However Farmers Reducer uses plain Sodium Thiosulphate and the action is far more gentle and it's useful for lightening shadow details and much slower working.

    Ian

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