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  1. #11

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    I have a package market as 125g, 4.4oz and is good for 950ml (0.25 US gallon) stock and/or 4.73 (1.25 US gallons) working solution.
    Rafael

  2. #12

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    Quote Originally Posted by FrankB
    I've done the sums based on my supply. If Matt mixes 24g of HCA powder per litre of water he will end up with a working strength solution, regardless of size of his packet.

    Ahem, I could have put that better really! I'll get my coat...
    Close enough for govenment work, Frank!
    Tom Hoskinson
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    Everything is analog - even digital :D

  3. #13
    FrankB's Avatar
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    My public reason is these pesky d****** scales only read out in 2g increments.

    I could tell you the real reason...

    ...but then I'd have to kill you!
    The destination is important, but so is the journey

  4. #14
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    It doesn’t necessarily apply in this instance, but there is always a danger with dry chemicals that they are not mixed consistently in the bag, or that they have separated since packaging. Therefore when a portion is selected, as here, the consistency of the mix can be uneven, and cause problems.
    Much better to mix the entire contents as recommended, and store the stock solution for future use.
    Regards Dave.

    An English Eye


  5. #15
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    Fair point, Dave. I hadn't thought of that.

    Oh well, looks like I have a use for all those old storage bottles after all!
    The destination is important, but so is the journey

  6. #16

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    I must concur with Dave Miller. (Mix the entire amount of dry chemicals)
    When I first started to develop B&W film my idea was to make small amounts (1 liter) from huge packages of dry chemicals that I purchased at a local auction. My "old school" mentor pointed out that these bags held a variety of compounds , each having a different weight. You could never be sure of consistency from one batch to the other.

    Mike

  7. #17
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    OK - on examining the bag more closely it carries instructions of making a stock solution or a working solution - the whole contents makes 3.8L / 1 US gallon Stock OR 5 US gallon working. I guess I make a stock and store - although I need some more containers and I need to use it tonight so I may go with Franks's idea now and make a stock solution later.

    Thanks for the very helpful posts.

    Matt

  8. #18
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    In light of other posts, I'd give the bag a damn good shake before using my (less than brilliant, as it turns out!) suggestion!

    All the best,

    Frank
    The destination is important, but so is the journey

  9. #19

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    Quote Originally Posted by FrankB
    In light of other posts, I'd give the bag
    a damn good shake
    Prospectors call that Jigging. Jigging is used
    to Separate the constituents of a mixture. Now
    you wouldn't want to do that would you?

    From the kitchen find a mixing bowl. Pour in all
    the mix then Fold and Stir. Dan

  10. #20
    FrankB's Avatar
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    <sigh> I'm not having a good day.

    Dan, I agree that your method is probably better (and from now on I'm going back to liquid chems where I belong). I would however suggest that it is possible to combine powdered ingredients of differing densities, to some extent, by means of violent agitation (a.k.a. "a damn good shake") in a sealed container without contaminating other vessels.

    However, to complete your recommendation, I would also suggest that after implementing your method the bowl should not be returned to the kitchen but should be "acquired" for darkroom use only...
    The destination is important, but so is the journey

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