Acufine Acu-1 substitute

Discussion in 'Darkroom Developing and Printing' started by piterengel, Apr 5, 2008.

  1. piterengel

    piterengel Guest

    Hello, because it is quite difficult to find Acu-1 developer, is there
    a subsitute with analogue characteristics? Microdol for example? I
    would like to use it with MACO IR film, to obtain less grain than the
    one I have normally with HC-110. Thanks.
     
    piterengel, Apr 5, 2008
    #1
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  2. I don't know what is in Acufine. Microdol-X and Ilford
    Perceptol are identical. They use common salt as the fine
    grain agent in a low activity Metol developer. Both yield
    finer grain than standard developers when used full strength
    at the cost of about a stop of speed. I have started to use
    Perceptol as my standard for 35mm 100T-Max, the grain being
    comparable to the late, lamented, Kodak Technical Pan in
    Technidol. I have no idea of how well it would work for the
    Maco film but its worth a try. I doubt if any practical
    developer will give you finer grain.
    When diluted the extra-fine-grain property is lost. At
    1:3 either developer will deliver full film speed and about
    the same grain as D-76 but with significant acutance
    effects.
     
    Richard Knoppow, Apr 6, 2008
    #2
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  3. piterengel

    jch Guest

    _____
    In an old booklet by ZONE V Inc. on page 25 is an Acufine substitute:

    Water at 125F 2-1/2 cups 500 ml
    Sodium sulphite 2 TBSP + 1 tsp 53 g
    Hydroquinone 1-1/2 tsp 4.5 g
    Sodium carbonate 1/4 tsp + 1/8 tsp 2.3 g
    Borax 1/2 tsp 2.5 g
    Potassium bromide 1/8 tsp 10 ml of a 10 wt% solution
    Phenidone 1/8 tsp 0.25 g or 125 ml concentrate
    Water to make 1 liter

    Below the formula it says: "Phenidone in this formula gives a boost to
    shadow detail. Development time for roll film at 68F is 2-1/4 to 5-1/4
    minutes."

    The phenidone concentrate:
    Water at 125F 3 cups
    Sodium bisulphite 1 tsp
    Phenidone 1 tsp
    Water to make 1 liter

    125 ml or 4 oz contain 0.25 g or 1/8 tsp of phenidone

    The sodium sulphite is necessary to help the phenidone dissolve properly.

    I don't like using tsp and TBSP volume measures. As well, i have
    provided the mass equivalents of the various component's tsp and TBSP
    volumes. The conversions to grams were given in the ZONE V booklet.

    I have used this formula on 35 mm film with good results. I am not
    familiar with MACO IR film. The Acufine substitute formula is worth a
    try. Let us know how it works.
     
    jch, Apr 6, 2008
    #3
  4. piterengel

    jch Guest

    Since there is no copyright mentioned in the ZONE V Inc. booklet i have
    scanned it, and converted it to LaTeX. I compiled it to PostScript and
    PDF files. There are some very useful formulas and advice in the
    booklet. I suppose that this small document came with a kit full of
    photographic chemicals at one time. You will find these two files at
    http://24.108.145.235/photography/

    There is also an HTML version at
    http://24.108.145.235/photography/zone_v/index.html

    The web server will remain on-line for about one month.
     
    jch, Apr 17, 2008
    #4
  5. piterengel

    jjs Guest

    Is it THAT old? Must be 'cause it's before Zone VI.

    Anywho, somebody's going to suggest that maybe it doesn't need a copyright
    statement to be copywrighted. Me, I'll just take your site down. Right now.
    But I'll let it go Real Soon Now.
     
    jjs, Apr 17, 2008
    #5
  6. piterengel

    jjs Guest

    You are rather optimisitc thinking you will have the same ip address via
    cable and be up all the time. Now let's check that copyright situation.
     
    jjs, Apr 18, 2008
    #6
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