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  1. #1

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    Why dilute developer???

    For Tmax 100 it says use at Tmax at 1:4 dilution. So i did that. BOTH rolls were so light gray i probably won't get a decent print.
    (Been using Tmax and D76 stock for months)
    Thought maybe i didn't expose right.
    Tonight developed 3 rolls tmax 1:4 , ALL very light gray negs. No blacks at all.
    Developed roll of Kentmere 100 in Tmax stock, VERY nice negs.

    Why would they recommend diluting developers anyway?

  2. #2
    PanTomasz's Avatar
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    Did You extend the bath time too?

  3. #3
    dmb
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    By 'stock' do you mean TMax developer diluted 1:4 from original concentrate? Looking at the Tmax 100 data sheet the reference to 1:4 would appear to apply to the 'stock' NOT a diluted stock. Looking at the pdfs of the TMax Dev and Tmax 100 datasheets they are not great examples of precise end user instructions.

  4. #4
    Alan W's Avatar
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    i've never heard of anyone using tmax developer as a stock solution.i've used it 1+4(2 oz developer and 8oz water) and never got bad negatives.i've even used it 1+9 with tmax 100 and love it.

  5. #5
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    If the numbers along the edge of the film are light grey, then it's underdeveloped, not underexposed. When you dilute developer, you need to extend the time in it. You might check out the Massive Dev. Chart on the Digital Truth website, it's a great guide for development times.

  6. #6

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    Quote Originally Posted by ezwriter View Post

    Why would they recommend diluting developers anyway?
    As others have said, you have to increase the development time the more you dilute the developer.

    But developer is diluted for practical reasons, particularly to give you realistic development times. Stock solutions may only take two or three minutes to develop a film, which means everything has to be timed to perfection and agitated to perfection, small discrepancies in temperature, and time making big differences to the negs. So diluted the developer is more gentle, allowing small differences in agitation, temperature and time, and making more predictable processing possible. Developer is also diluted to control contrast, by which the developer becomes exhausted in the highlights before it does in the shadows, so giving better shadow detail and less chance of blown highlight detail.
    http://www.flickr.com/photos/steve_barnett/

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    landscape photographs in and around the Peak District National Park, UK.

  7. #7

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    Tmax developer, on the shelf, is a concentrated developer (syrup). One syrup plus four water is the standard dilution for a stock developer solution.

    If you initially diluted the Tmax 1+4 out of the bottle to make a stock solution and then diluted that stock solution 1+4 again and used standard dev times you will get thin negs; this will work but you must extend the dev time by about 2X.

    If you diluted the raw syrup from the bottle 1+4 (proper dilution), developed for listed time and you got thin negs you may have exhausted developer. How old is the raw syrup? If, as Suzanne said, you see the numbers on the edges are not solid black you either underdeveloped (time/agitation wise), have exhausted developer or over diluted when you mixed the stock solution.

    If you diluted all the syrup 1+4 when you purchased the bottle initially, your stock solution won't last very long on the shelf and will oxidize quickly. Dilute 1+4 from the raw syrup as needed.
    Last edited by Fred Aspen; 02-03-2013 at 10:01 AM. Click to view previous post history.
    -Fred

  8. #8

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    Read the following site, all will be revealed. http://www.kodak.com/global/en/profe...bs/j86/j86.pdf
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  9. #9
    polyglot's Avatar
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    Quote Originally Posted by ezwriter View Post
    Why would they recommend diluting developers anyway?
    I can't speak to your Tmax failure, but dilution is generally done to make the development time tractable (as mentioned above), or to change the behaviour of the developer in some important way.

    For example, D76 contains a silver solvent which becomes rapidly less effective with higher dilutions. So D76 stock gives very smooth negatives at the cost of some resolution because the grain has been heavily dissolved; D76 1+1 is a nice general-purpose intermediate and D76 1+3 gives very sharp negatives with practically no solvent effect.

    Rodinal also changes with dilution: at around 1+25 to 1+50 it acts as a normal developer with no solvent. At 1+100 or more and longer times with no agitation, you get local exhaustion of developer in the highlights, so it becomes both compensating and sharpening.

    I don't use Tmax dev so I can't tell you what it will do with varying dilution.

  10. #10

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    OMG i'm an idiot! i think what i did was, mixed a gallon of Tmax a week ago, then diluted it 1:4 yesterday so yeah, it was diluted twice.
    Now with this 1/2 gallon left are you saying its gone bad? going bad? How long does it realistically last in photo brown jug after mixing?
    i will mix as needed from now . thanks!

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