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  1. #31

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    Nov 2004
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    According to Victor Regnault, Elements of Chemistry, 1853, Pyrogallic acid may be prepared by carefully heating powdered galls (I believe these come from Oak and other trees).Search 'regnault powdered galls' for the book page.
    Heating limestone gives calcium oxides which would provide sodium hydroxide alkali when reacted with sea water.
    Pyrogallic acid + sodium hydroxide=developer?
    Make sure the Island elf'n safety officer isnt looking.
    Last edited by Alan Johnson; 06-25-2009 at 01:48 PM. Click to view previous post history.

  2. #32
    Akki14's Avatar
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    Oak trees aren't commonly found on small sea islands though (?)
    Galls are caused by a small parasite thing that climbs into the tree and makes the tree react with a big wart-type ball. You can also boil galls to make black ink.
    ~Heather
    oooh shiny!
    http://www.stargazy.org/

  3. #33
    Alex Bishop-Thorpe's Avatar
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    The fact APUG takes on abstract topics like this with such enthusiasm is exactly what makes it such a brilliant community.

    Also, you're all batty.

    But this is amazingly interesting.
    The Analogue Laboratory, or 'so you built a darkroom in an old factory in the industrial zone'.
    Blog thing!.

    Worry less. Photograph more.

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