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  1. #1
    David Lyga's Avatar
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    Without a buffer will my developer suffer?

    I regularly mix a simple B&W film developer using 1g metol, 3g HQ, only 6g sulfite and 1g carbonate, mono. This does the job well. I ALWAYS use it 'one shot' at a rather high dilution (hence, the carbonate). Doing this, I never experience changes in energy due to the passage of time, even after six months or more (I store in PET plastic, filled to the rim, thus I get away with using such a small amount of sulfite, as this plastic does not 'breathe').

    Should there be a buffer included in my formula? Or is the buffer primarily for a replenishment system? Again, I experience no problems but just want more light on the purpose and function of buffer as relates to proper pH maintenance. - David Lyga

  2. #2
    Steve Smith's Avatar
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    I'm no expert but I think the buffer is to make it alkaline and it would be too acidic without it.


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  3. #3
    David Lyga's Avatar
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    I think, Steve, its purpose is to maintain the SAME pH. Correct if I am wrong. - David Lyga

  4. #4

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    Buffering is to maintain a pH with dilution etc. Not all developers are buffered.

  5. #5

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    Carbonate has some buffering properties. As it gets neutralized and converts into bicarbonate, it will gain some buffering capacity.
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

  6. #6

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    A buffer is not really needed when a developer is used as a one-shot. The formula that you use is similar to the Beutler formula which contains no specific buffer.
    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

  7. #7
    Ian Grant's Avatar
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    A buffer's more important when a developer is re-used (and often replenished) as it keeps the pH more stable.

    Ian

  8. #8
    David Lyga's Avatar
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    That's the confirmation I was seeking. Thank you. - David Lyga

  9. #9
    Trask's Avatar
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    I confess your post has me confused, David. If the developer is mixed as a one-shot, why is the issue of storage being discussed? I can only speculate that you are mixing larger quantities of the chemicals (in the proportions you discuss) in a concentrated solution, then dilute when needed, as with HC-110.

    So I wind up uncertain as to whether a buffer is truly necessary or not.

  10. #10
    David Lyga's Avatar
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    No Trask and I think that you just caught me with semantics!
    It is not MIXED one shot but USED one shot. Sorry for the confusion. I mix several liters at one time. - David Lyga



 

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