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    A bit of Internet research shows that "alum" is...

    A bit of Internet research shows that "alum" is aluminum sulphate.

    "Styptic pencil" seems to be composed mostly of aluminum sulphate, with some titanium dioxide to give it a white color.

    ...
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    I think that a "styptic pencil" _is_ alum -- a...

    I think that a "styptic pencil" _is_ alum -- a thin cylinder of alum.

    That's what I use. It's not perfect, but it beats cold water, IMHO.

    Charles
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