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  1. #11

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    What is the best way to buy the checmicals. Also I am not good at chemistry but I am learning and I like to make a liter of working solution at a time. I do not normally make the step before working I just make the working. Is this a bad way to mix chemicals?

    Thanks,

    Kev

  2. #12

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    I don't think that that's a bad way to mix the chemicals. Sometime I don't mix the concentrate either, I just mix the working solution. Can't think of a reason not to do it... anyone?

  3. #13
    Juraj Kovacik's Avatar
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    The http://www.bostick-sullivan.com/ is a very good source

  4. #14
    Ole
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    Quote Originally Posted by ceratto
    I was told that potassium ferricyanide + acetic acid (stop bath) would produce cyanide gas. Will potassium dichromate also do this? (assuming the former is even true as I've never verified or tried it).
    Pot ferri will give off cyanide in a strong acid. If your stop bath was that strong, you would etch the emulsion right off the paper... I wouldn't worry.

    The cyanide would come from breakdown of the ferricyanide. So it cannot happen with dichromate.
    -- Ole Tjugen, Luddite Elitist
    Norway

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