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    Re: Sextant on ebay
    From: Bill B
    Date: 2006 Sep 6, 23:49 -0500

    Fred

    > It's carcinogenic, hence
    > the replacement.  In general, one would want to use these solvents in
    > a fume hood, or failing that, a very well ventilated area.

    Your excellent last point first. All this stuff is very nasty.  Unless one
    has a great lab setting use it outdoors in a light breeze and stay upwind,
    wear a long-sleeve shirt and rubber gloves that won't melt (at very least),
    and drop $25-30 for a suitable and well-fitting double-cart mask.  I can all
    but promise that one and an old toothbrush will be getting up-close and
    personal with this thing.

    My other concern, which I hoped someone would jump on, is that tearing the
    sextant down to component parts and reassembling my make it handsome, but
    throw it seriously out of whack. In the end we are, at 0.1'/6" increments,
    trying to measure 1/10th of 1/60th of 1/360th.  Nominally 5 millionths of a
    circle.

    > I don't know what the ingredient in the orange-citrus stripper is,
    > but have used an orange-citrus solvent to replace xylene in
    > dehydrating tissues for microscopy.  It smells very strongly like
    > oranges so I would expect googling for citronal or similar might hit
    > the material.  Xylene is a fairly non-polar solvent, and formerly a
    > common ingredient in paint thinner, etc.

    Way over my head here. 30+ years since college chemistry and biology. All I
    can do is report.

    The CITRISTRIP spray can states, "Contains Citrus Terpenes, Dimethyl Ether,
    1-Methyl-2-Pyrrolidone . . . MAX V.O.C. - 98% by Weight."

    Which I believe may be the flavor enhancers and preservatives in TV dinners
    and other processed foods? ;-)

    Bill


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