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  1. #11
    Photo Engineer's Avatar
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    Well, I'm conservative in this, but Kirk and Ian are both right. It can keep a very long time as both a solid and in solution, especially stored well in dark bottles.

    PE

  2. #12
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    How does one know if potassium ferricyanide goes bad if it is in solid form? Does the colour change? I have stockpiled a fair bit of it because of the difficulty of acquiring it.
    "The secret to life is to keep your mind full and your bowels empty. Unfortunately, the converse is true for most people."

  3. #13
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    It goes blue when it decomposes.

    Ian

  4. #14

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    Quote Originally Posted by Ian Grant View Post
    It goes blue when it decomposes.

    Ian
    Thank's Ian, I was also wondering about that. I also have a half full 1 lb brown glass jar from Kodak that's more than 30 years old and the crystals are still bright red/orange color - always kept it in a dark place.

    Paul
    "Pictures are not incidental frills to a text; they are essences of our distinctive way of knowing." Stephen J. Gould

  5. #15
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    Quote Originally Posted by Ian Grant View Post
    It goes blue when it decomposes.

    Ian
    Yes, thank you Ian.
    "The secret to life is to keep your mind full and your bowels empty. Unfortunately, the converse is true for most people."

  6. #16

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    From the other current thread dealing with ferricyanide
    I see it's longevity at working strength when EXTREMELY
    dilute is an issue. As an oxidizer any organic or other
    oxidizable matter will kill it. So for post exposure
    pre-development use I'd suggest distilled. Dan

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