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    Hardware store Xylene in A-12 bubble sextant?
    From: Jim Speedwell
    Date: 2017 Oct 4, 13:40 -0700

    I just bought an A-12 sextant with a dry bubble chamber, which I need to refill.

    The manual calls for “chemically pure xylene”, I can find high purity xylene on Amazon, which seems to be good, but it’s expensive.

    I know Hardware store Xylene contains impurities, what would be the harm of these impurities in a bubble chamber besides possibly leaving a residue?

    And couldn’t you check for residue, by pouring the xyline into an open container and letting it to evaporate and then see if it left a film?

    Thanks.

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